Javascript: Array

ARRAY

// homogenious and heterogenious array
var a = 'I am here';
var status = true;

//array -> multiple values
var arr = new Array(); //constructor method
var arr1 = []; //bracket notation
Example:
var hobbies = ['dancing', true, 3423,{ //multiple type data collection values
dance: true,
singing: false
}, []];

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Javascript: Object to Array and Array to Object

Output: Final Array [ { mango: 1 }, { apple: 2 }, { banana: 3 }, { orange: 1 }, { watermelon: 1 }, { papaya: 1 } ] Output: Final Object { mango: 1, apple: 2, banana: 3, orange: 1, watermelon: 1, papaya: 1 }

Javascript: Callback and High Order Function

CALLBACK A callback is a function that gets invoked after an asynchronous result appears. a callback function is an async function argument. - Asynchronous code result handle using callback and promises. // callback function function with argument // ---argument :// if a function pass-through function as an argument, it is higher-order function. function needs to be called in order to execute. a callback is used when calling a function asynchronous What is a Callback or Higher-order Function? A callback function , also known as a higher-order function, is a function that is passed to another function (let’s call this other function “otherFunction”) as a parameter, and the callback function is called (or executed) inside the otherFunction. A callback function is essentially a pattern (an established solution to a common problem), and therefore, the use of a callback function is also known as a callback pattern. High-order function is a function that takes ...

Javascript Higher Order Function:Reduce, Map, Filter, Sort Examples

Reduce Example 1: Example 2: Map Filter Sort Combined Method

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