#javascriptweird — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #javascriptweird, aggregated by home.social.
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Math.min() > Math.max() Returns TRUE?!
⚠️ YOUR BRAIN WILL EXPLODE! Math.min() is GREATER than Math.max()! This breaks EVERY rule of mathematics! The answer will shock you. 97% of developers get this wrong!
#javascript #javascripttricks #codingchallenge #math.min #math.max #javascriptquiz #javascriptweird #javascriptwtf #mindblown #javascriptbugs #codingtips #javascriptshorts
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Reflect API Shows HIDDEN Properties?!
Reflect.ownKeys REVEALS secrets! It shows non-enumerable properties that Object.keys hides. This is how you see ALL properties, even hidden ones!
#javascript #javascripttricks #reflectapi #propertyenumeration #hiddenproperties #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #reflection #advancedjavascript
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void Operator Returns WHAT?!
🤯 MIND BLOWN! The void operator ALWAYS returns undefined, no matter what! void(1+2+3) = undefined! This ancient JavaScript feature is still used in modern code. 95% of devs don't know this exists!
#javascript #javascripttricks #codingchallenge #voidoperator #javascriptoperators #javascriptquiz #javascriptweird #javascriptwtf #javascriptsecrets #codingtips #javascriptshorts
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void Operator Returns WHAT?!
🤯 MIND BLOWN! The void operator ALWAYS returns undefined, no matter what! void(1+2+3) = undefined! This ancient JavaScript feature is still used in modern code. 95% of devs don't know this exists!
#javascript #javascripttricks #codingchallenge #voidoperator #javascriptoperators #javascriptquiz #javascriptweird #javascriptwtf #javascriptsecrets #codingtips #javascriptshorts
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void Operator Returns WHAT?!
🤯 MIND BLOWN! The void operator ALWAYS returns undefined, no matter what! void(1+2+3) = undefined! This ancient JavaScript feature is still used in modern code. 95% of devs don't know this exists!
#javascript #javascripttricks #codingchallenge #voidoperator #javascriptoperators #javascriptquiz #javascriptweird #javascriptwtf #javascriptsecrets #codingtips #javascriptshorts
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void Operator Returns WHAT?!
🤯 MIND BLOWN! The void operator ALWAYS returns undefined, no matter what! void(1+2+3) = undefined! This ancient JavaScript feature is still used in modern code. 95% of devs don't know this exists!
#javascript #javascripttricks #codingchallenge #voidoperator #javascriptoperators #javascriptquiz #javascriptweird #javascriptwtf #javascriptsecrets #codingtips #javascriptshorts
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void Operator Returns WHAT?!
🤯 MIND BLOWN! The void operator ALWAYS returns undefined, no matter what! void(1+2+3) = undefined! This ancient JavaScript feature is still used in modern code. 95% of devs don't know this exists!
#javascript #javascripttricks #codingchallenge #voidoperator #javascriptoperators #javascriptquiz #javascriptweird #javascriptwtf #javascriptsecrets #codingtips #javascriptshorts
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Constructor Can Return DIFFERENT Object?!
Constructors can LIE about what they create! If you return an object, it REPLACES the instance. The 'new' keyword becomes USELESS. instanceof returns false! This breaks OOP principles!
#javascript #javascripttricks #constructor #classsyntax #instanceof #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #oopquirks #advancedjavascript
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typeof Works in Temporal Dead Zone?!
Temporal Dead Zone has a LOOPHOLE! typeof works on undeclared variables (returns undefined) but throws ReferenceError for let/const. This inconsistency is INSANE!
#javascript #javascripttricks #tdz #temporaldeadzone #typeof #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #variablehoisting #advancedjavascript
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Comma Operator Returns LAST Value Only?!
⚠️ THIS IS INSANE! The comma operator evaluates ALL expressions but returns ONLY the last one! (1,2,3,4,5) = 5! Used in for loops everywhere but nobody notices. Tag a dev who needs this!
#javascript #javascripttricks #codingchallenge #commaoperator #javascriptoperators #javascriptquiz #javascriptweird #javascriptwtf #forloops #codinginterview #javascriptshorts
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Comma Operator Returns LAST Value Only?!
⚠️ THIS IS INSANE! The comma operator evaluates ALL expressions but returns ONLY the last one! (1,2,3,4,5) = 5! Used in for loops everywhere but nobody notices. Tag a dev who needs this!
#javascript #javascripttricks #codingchallenge #commaoperator #javascriptoperators #javascriptquiz #javascriptweird #javascriptwtf #forloops #codinginterview #javascriptshorts
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Comma Operator Returns LAST Value Only?!
⚠️ THIS IS INSANE! The comma operator evaluates ALL expressions but returns ONLY the last one! (1,2,3,4,5) = 5! Used in for loops everywhere but nobody notices. Tag a dev who needs this!
#javascript #javascripttricks #codingchallenge #commaoperator #javascriptoperators #javascriptquiz #javascriptweird #javascriptwtf #forloops #codinginterview #javascriptshorts
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Comma Operator Returns LAST Value Only?!
⚠️ THIS IS INSANE! The comma operator evaluates ALL expressions but returns ONLY the last one! (1,2,3,4,5) = 5! Used in for loops everywhere but nobody notices. Tag a dev who needs this!
#javascript #javascripttricks #codingchallenge #commaoperator #javascriptoperators #javascriptquiz #javascriptweird #javascriptwtf #forloops #codinginterview #javascriptshorts
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Comma Operator Returns LAST Value Only?!
⚠️ THIS IS INSANE! The comma operator evaluates ALL expressions but returns ONLY the last one! (1,2,3,4,5) = 5! Used in for loops everywhere but nobody notices. Tag a dev who needs this!
#javascript #javascripttricks #codingchallenge #commaoperator #javascriptoperators #javascriptquiz #javascriptweird #javascriptwtf #forloops #codinginterview #javascriptshorts
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with() Changes Variable Scope?!
💥 DEPRECATED BUT STILL WORKS! The 'with' statement changes your scope and makes variables magically refer to object properties! Banned in strict mode but still in old codebases. This caused HUGE security bugs!
#javascript #javascripttricks #codingchallenge #withstatement #scope #javascriptquiz #javascriptweird #javascriptwtf #deprecated #javascriptbugs #javascriptshorts
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with() Changes Variable Scope?!
💥 DEPRECATED BUT STILL WORKS! The 'with' statement changes your scope and makes variables magically refer to object properties! Banned in strict mode but still in old codebases. This caused HUGE security bugs!
#javascript #javascripttricks #codingchallenge #withstatement #scope #javascriptquiz #javascriptweird #javascriptwtf #deprecated #javascriptbugs #javascriptshorts
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with() Changes Variable Scope?!
💥 DEPRECATED BUT STILL WORKS! The 'with' statement changes your scope and makes variables magically refer to object properties! Banned in strict mode but still in old codebases. This caused HUGE security bugs!
#javascript #javascripttricks #codingchallenge #withstatement #scope #javascriptquiz #javascriptweird #javascriptwtf #deprecated #javascriptbugs #javascriptshorts
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with() Changes Variable Scope?!
💥 DEPRECATED BUT STILL WORKS! The 'with' statement changes your scope and makes variables magically refer to object properties! Banned in strict mode but still in old codebases. This caused HUGE security bugs!
#javascript #javascripttricks #codingchallenge #withstatement #scope #javascriptquiz #javascriptweird #javascriptwtf #deprecated #javascriptbugs #javascriptshorts
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with() Changes Variable Scope?!
💥 DEPRECATED BUT STILL WORKS! The 'with' statement changes your scope and makes variables magically refer to object properties! Banned in strict mode but still in old codebases. This caused HUGE security bugs!
#javascript #javascripttricks #codingchallenge #withstatement #scope #javascriptquiz #javascriptweird #javascriptwtf #deprecated #javascriptbugs #javascriptshorts
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Object Keys Get AUTO-SORTED?!
Object key order is NOT guaranteed! Numeric string keys get SORTED before other keys. You add 'b' first but '1' appears first in Object.keys()! This auto-sorting will DESTROY your expected order!
#javascript #javascripttricks #object.keys #keyordering #numerickeys #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #objectquirks #advancedjavascript
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Object Keys Get AUTO-SORTED?!
Object key order is NOT guaranteed! Numeric string keys get SORTED before other keys. You add 'b' first but '1' appears first in Object.keys()! This auto-sorting will DESTROY your expected order!
#javascript #javascripttricks #object.keys #keyordering #numerickeys #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #objectquirks #advancedjavascript
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Object Keys Get AUTO-SORTED?!
Object key order is NOT guaranteed! Numeric string keys get SORTED before other keys. You add 'b' first but '1' appears first in Object.keys()! This auto-sorting will DESTROY your expected order!
#javascript #javascripttricks #object.keys #keyordering #numerickeys #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #objectquirks #advancedjavascript
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Object Keys Get AUTO-SORTED?!
Object key order is NOT guaranteed! Numeric string keys get SORTED before other keys. You add 'b' first but '1' appears first in Object.keys()! This auto-sorting will DESTROY your expected order!
#javascript #javascripttricks #object.keys #keyordering #numerickeys #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #objectquirks #advancedjavascript
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Object Keys Get AUTO-SORTED?!
Object key order is NOT guaranteed! Numeric string keys get SORTED before other keys. You add 'b' first but '1' appears first in Object.keys()! This auto-sorting will DESTROY your expected order!
#javascript #javascripttricks #object.keys #keyordering #numerickeys #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #objectquirks #advancedjavascript
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Labels Let You BREAK NESTED Loops?!
🔥 SECRET FEATURE! You can break out of nested loops using labels! outer: for... break outer; This skips BOTH loops at once! Senior devs don't even know this. Save this for your next interview!
#javascript #javascripttricks #codingchallenge #labeledstatements #breakstatement #nestedloops #javascriptquiz #javascriptweird #codinginterview #codingtips #javascriptshorts
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Labels Let You BREAK NESTED Loops?!
🔥 SECRET FEATURE! You can break out of nested loops using labels! outer: for... break outer; This skips BOTH loops at once! Senior devs don't even know this. Save this for your next interview!
#javascript #javascripttricks #codingchallenge #labeledstatements #breakstatement #nestedloops #javascriptquiz #javascriptweird #codinginterview #codingtips #javascriptshorts
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Labels Let You BREAK NESTED Loops?!
🔥 SECRET FEATURE! You can break out of nested loops using labels! outer: for... break outer; This skips BOTH loops at once! Senior devs don't even know this. Save this for your next interview!
#javascript #javascripttricks #codingchallenge #labeledstatements #breakstatement #nestedloops #javascriptquiz #javascriptweird #codinginterview #codingtips #javascriptshorts
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Labels Let You BREAK NESTED Loops?!
🔥 SECRET FEATURE! You can break out of nested loops using labels! outer: for... break outer; This skips BOTH loops at once! Senior devs don't even know this. Save this for your next interview!
#javascript #javascripttricks #codingchallenge #labeledstatements #breakstatement #nestedloops #javascriptquiz #javascriptweird #codinginterview #codingtips #javascriptshorts
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Labels Let You BREAK NESTED Loops?!
🔥 SECRET FEATURE! You can break out of nested loops using labels! outer: for... break outer; This skips BOTH loops at once! Senior devs don't even know this. Save this for your next interview!
#javascript #javascripttricks #codingchallenge #labeledstatements #breakstatement #nestedloops #javascriptquiz #javascriptweird #codinginterview #codingtips #javascriptshorts
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new Function() Ignores Local Scope?!
Function constructor is DANGEROUS! It always runs in GLOBAL scope, ignoring any variables in the enclosing function. Your local 'x' becomes invisible. This scoping behavior will cause HIDDEN bugs!
#javascript #javascripttricks #functionconstructor #globalscope #variablescope #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #scopequirks #advancedjavascript
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new Function() Ignores Local Scope?!
Function constructor is DANGEROUS! It always runs in GLOBAL scope, ignoring any variables in the enclosing function. Your local 'x' becomes invisible. This scoping behavior will cause HIDDEN bugs!
#javascript #javascripttricks #functionconstructor #globalscope #variablescope #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #scopequirks #advancedjavascript
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new Function() Ignores Local Scope?!
Function constructor is DANGEROUS! It always runs in GLOBAL scope, ignoring any variables in the enclosing function. Your local 'x' becomes invisible. This scoping behavior will cause HIDDEN bugs!
#javascript #javascripttricks #functionconstructor #globalscope #variablescope #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #scopequirks #advancedjavascript
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new Function() Ignores Local Scope?!
Function constructor is DANGEROUS! It always runs in GLOBAL scope, ignoring any variables in the enclosing function. Your local 'x' becomes invisible. This scoping behavior will cause HIDDEN bugs!
#javascript #javascripttricks #functionconstructor #globalscope #variablescope #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #scopequirks #advancedjavascript
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new Function() Ignores Local Scope?!
Function constructor is DANGEROUS! It always runs in GLOBAL scope, ignoring any variables in the enclosing function. Your local 'x' becomes invisible. This scoping behavior will cause HIDDEN bugs!
#javascript #javascripttricks #functionconstructor #globalscope #variablescope #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #scopequirks #advancedjavascript
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Tagged Template Does MATH in Strings?!
Tagged templates can EXECUTE CODE! The tag function receives values and can transform them. This one DOUBLES every number. String interpolation becomes code execution!
#javascript #javascripttricks #taggedtemplates #templateliterals #stringinterpolation #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #templateprocessing #advancedjavascript
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Tagged Template Does MATH in Strings?!
Tagged templates can EXECUTE CODE! The tag function receives values and can transform them. This one DOUBLES every number. String interpolation becomes code execution!
#javascript #javascripttricks #taggedtemplates #templateliterals #stringinterpolation #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #templateprocessing #advancedjavascript
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Tagged Template Does MATH in Strings?!
Tagged templates can EXECUTE CODE! The tag function receives values and can transform them. This one DOUBLES every number. String interpolation becomes code execution!
#javascript #javascripttricks #taggedtemplates #templateliterals #stringinterpolation #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #templateprocessing #advancedjavascript
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Tagged Template Does MATH in Strings?!
Tagged templates can EXECUTE CODE! The tag function receives values and can transform them. This one DOUBLES every number. String interpolation becomes code execution!
#javascript #javascripttricks #taggedtemplates #templateliterals #stringinterpolation #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #templateprocessing #advancedjavascript
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Tagged Template Does MATH in Strings?!
Tagged templates can EXECUTE CODE! The tag function receives values and can transform them. This one DOUBLES every number. String interpolation becomes code execution!
#javascript #javascripttricks #taggedtemplates #templateliterals #stringinterpolation #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #templateprocessing #advancedjavascript
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typeof Never Throws Error?!
typeof is INDESTRUCTIBLE! It works on undeclared variables WITHOUT throwing ReferenceError. Both declared undefined AND never-declared return 'undefined'. You can't tell them apart! This is INSANE!
#javascript #javascripttricks #typeof #undeclaredvariables #referenceerror #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #typechecking #advancedjavascript
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Spread Operator Works on STRINGS?!
Spread operator is MAGIC! It works on strings (splits to chars) but NOT on objects. This inconsistency will cause bugs when you least expect it!
#javascript #javascripttricks #spreadoperator #stringiteration #objectiteration #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #iterableprotocol #advancedjavascript
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Nullish Coalescing vs Logical OR?!
?? and || are DIFFERENT! Nullish coalescing only checks null/undefined. Logical OR checks ALL falsy values. 0 and '' behave differently! This matters!
#javascript #javascripttricks #nullishcoalescing #logicalor #falsyvalues #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #operatordifferences #advancedjavascript
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Labels Can Break ANY Block?!
JavaScript has GOTO in disguise! Labels with break can exit ANY block, not just loops! This code jumps OUT of nested blocks instantly. Most developers have NEVER seen this syntax!
#javascript #javascripttricks #labels #breakstatement #controlflow #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #hiddenfeatures #advancedjavascript
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Array Methods Work on NON-Arrays?!
Array methods are DECEPTIVE! They work on any object with length property. This object isn't an array, but map() works on it! JavaScript lies about types!
#javascript #javascripttricks #arraymethods #arraylikeobjects #typecoercion #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #ducktyping #advancedjavascript
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Array Methods Work on NON-Arrays?!
Array methods are DECEPTIVE! They work on any object with length property. This object isn't an array, but map() works on it! JavaScript lies about types!
#javascript #javascripttricks #arraymethods #arraylikeobjects #typecoercion #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #ducktyping #advancedjavascript
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Array Methods Work on NON-Arrays?!
Array methods are DECEPTIVE! They work on any object with length property. This object isn't an array, but map() works on it! JavaScript lies about types!
#javascript #javascripttricks #arraymethods #arraylikeobjects #typecoercion #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #ducktyping #advancedjavascript
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Array Methods Work on NON-Arrays?!
Array methods are DECEPTIVE! They work on any object with length property. This object isn't an array, but map() works on it! JavaScript lies about types!
#javascript #javascripttricks #arraymethods #arraylikeobjects #typecoercion #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #ducktyping #advancedjavascript
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Array Methods Work on NON-Arrays?!
Array methods are DECEPTIVE! They work on any object with length property. This object isn't an array, but map() works on it! JavaScript lies about types!
#javascript #javascripttricks #arraymethods #arraylikeobjects #typecoercion #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #ducktyping #advancedjavascript
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String Primitives Have Methods But No Properties?!
Strings are DECEPTIVE! They have methods (auto-boxing) but you can't assign properties. Properties disappear immediately. This is primitive vs object confusion!
#javascript #javascripttricks #stringprimitives #autoboxing #propertyassignment #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #primitivetypes #advancedjavascript
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Array Holes Are NOT undefined?!
MIND BLOWN! An empty slot in an array is NOT the same as undefined. The hole doesn't exist as a property! map() SKIPS holes but processes undefined. This invisible difference will break your code!
#javascript #javascripttricks #arrayholes #sparsearrays #undefined #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #arraymethods #advancedjavascript