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Coding Challenges

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Why does typeof null return 'object' but null instanceof Object is false in JavaScript?
Easy
TypeofInstanceofJavascript quirks
Understanding 'this' Binding in Arrow Functions with Object Methods in JavaScript
Easy
ThisJavascript
How to Implement a Custom Array Map Method in JavaScript Using Prototypes
Hard
ArraysMapPrototypes+1
Understanding JavaScript Array Chaining: Filter and Map Operations Explained
Easy
ArraysFilterMap+1
How to Merge Two Arrays in JavaScript Without Modifying Original Arrays
Easy
ArraysConcatSpread operator
How to Deep Clone JavaScript Objects: Complete Guide with Examples
Hard
ObjectsCloningDeep copy
JavaScript Array Reduce: How to Sum Even Numbers Using Reduce Method
Medium
ReduceArraysJavascript
Understanding Error Handling with Async/Await in JavaScript Promise Rejection
Medium
AsyncAwaitError handling
JavaScript: How to Check if String Ends with Substring - endsWith vs Other Methods
Easy
StringsEndswithJavascript
Understanding JavaScript Closure: How Variable Scope Works in Nested Functions
Medium
ClosuresScopesFunctions
Why Does 0.1 + 0.2 Not Equal 0.3 in JavaScript Floating-Point Arithmetic?
Easy
NumbersFloating pointJavascript
Finding the Maximum Value in a JavaScript Array: Math.max() vs reduce() Method
Medium
ArraysReduceMath
How to Check if an Object is an Instance of a Class in JavaScript using instanceof
Easy
ClassesPrototypesInstanceof
How to iterate and print object keys using Object.keys() and for...of loop in JavaScript
Easy
ObjectsLoops
Understanding Object.freeze() Behavior with Function References in JavaScript
Medium
FunctionsObject.freezeImmutability
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