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for-of is a new loop in ES6 that replaces both for-in and forEach() and supports the new iteration protocol. Use it to loop over iterable objects (Arrays, strings, Maps, Sets, etc.; see Chap. “Iterables and iterators”) Syntax for…

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Template strings


String Interpolation String Interpolation is the way by which we can insert variable into string. In Javascript We have two type for String Interpolation. 1. Traditional 2. ES6 1. Traditional Way In traditional Javascript, string always encolsed within…

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Destructuring Destructuring is a way to quickly extract data out of an {} or [] without having to write much code. ES5 Way let foo = [‘x’, ‘y’, ‘z’]; let a = foo[0]; let b = foo[1]; let…

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Basic javascript algorithms

js algorithms

Get uniq from array // get uniq from array const nums = [1, 2, 1, 1, 2, 1, 3, 4, 1 ]; const uniq = […new Set(numbers)]; // => [ 1, 2, 3, 4 ] const uniq2 =…

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JSON, n JSON method


The JSON (JavaScript Object Notation) is a general format to represent values and objects. JSON is the string form of object. Syntax: JSON.stringify(value[, replacer[, space]]) Parameters: Value The value to convert to a JSON string. Replacer Optional The…

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ES6 arrow functions

es6 arrow function

Arrow function taken from CoffeeScript (a transcompiled language). Arrow function, also called “fat arrow” functions. This is represented by => (Flat Arrow). It is anonymous and can change the way this bind into function. When we are using…

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Javascript function arguments handling


In javascript we don’t have any method to check our parameters and arguments. Earlier tutorial, We have learned that functions can have parameters; like – functionName(parameter1, parameter2, parameter3) { code to be executed } but suppose that we…

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Javascript function


A function is a block of statements, which is used to perform a specific task.In javascript functions are defined with the function keyword. There are 3 ways to create a function. 1. by declaration. 2. by function expression. 3. by constructor. (good for…

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Loops Allow to repeat block code, until the given condition is true. In Javascript we have three basics types loops are available – for while do while for loop // for for (var i = 0; i <…

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Secret of falsy value


As we know true and false are related to boolean data type. Zero, empty string, undefined, null, NaN are falsy values. All non-empty things and true are Truthy values. But going to deep inside into falsy value. We need…

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