__interview

https://github.com/ganqqwerty/123-Essential-JavaScript-Interview-Questions https://github.com/rohan-paul/Awesome-JavaScript-Interviews/tree/master

Polyfills

https://github.com/mohitkumartoshniwal/javascript-interview-preparation/tree/main/polyfills

30th Aug

• delete only works if you delete property from object
• delete can remove array elements and make them undefined: delete arr[3]
• Function expressions are not hoisted

foo() // fails
var foo = function() {
	// something
}

• Singleton design pattern
• Deep clone and shallow clone implementation
• Detect undefined object property
  • Use in operator

var obj = {
    name: 'kk',
    age: undefined
};
console.log("age" in obj); // true
console.log("aged" in obj); // false

• check NaN using isNaN()
• Object hasOwnProperty check if you want to iterate over the properties of an object using in operator
• create a non-enumerable object property
• temporal dead zone
• pure function
• sparse and dense arrays
• Flux architecture in reactjs