Promise.resolve UNWRAPS Thenables?!
Promise.resolve has RECURSIVE unwrapping! Any object with a 'then' method gets called. Nested thenables unwrap ALL the way down until a real value appears. This automatic unwrapping will confuse your async code!
#javascript #javascripttricks #promise.resolve #thenables #asyncunwrapping #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #promisequirks #advancedjavascript
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
Arrow Functions Have NO arguments?!
Arrow functions BREAK arguments! They don't have the arguments object. This will cause ReferenceError when you try to use it. Regular functions work, arrows don't!
#javascript #javascripttricks #arrowfunctions #argumentsobject #thisbinding #javascriptweird #javascriptquiz #codingchallenge #javascriptshorts #javascriptwtf #functiondifferences #advancedjavascript
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
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
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
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
Array(3) vs [,,,] Are NOT The Same!
Creating arrays in JavaScript has a hidden trap! Array(3) and [,,,] look identical but behave completely differently. Mind blown!
#javascript #javascripttricks #codingtips #programmingtutorial #arrayconstructor #javascriptquiz #codingchallenge #javascriptshorts #javascriptbugs #sparsearrays #javascriptwtf #arraycreation
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
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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