Array map() Method In JavaScript

The map() method in JavaScript creates an array by calling a specific function on each element present in the parent array. It is a non-mutating method. Generally map() method is used to iterate over an array and calling function on every element of array. Syntax: array.map(function(currentValue, index, arr), thisValue) Parameters: This method accepts two parameters as mentioned above and described below: function(currentValue, index, arr): It is required parameter and it runs on each element of array. It contains three parameters which are listed below: currentValue: It is

What is Spread syntax (…) in JavaScript ?

pread syntax (…) allows an iterable such as an array expression or string to be expanded in places where zero or more arguments (for function calls) or elements (for array literals) are expected, or an object expression to be expanded in places where zero or more key-value pairs (for object literals) are expected. The Spread Syntax The spread syntax is simply three dots: … It allows an iterable to expand in places where 0+ arguments are expected. Definitions are tough without context.