Arrow Function Map Javascript

Javascript arrays and arrow functions estimated reading time: Const numbers = [1, 4, 9]; If you want an if statement with its own block, you need to write the function body as a block and explicitly include the return statement.

The map () method in javascript creates an array by calling a specific function on each element present in the parent array. Examples from various sources (github,stackoverflow, and others). I tried to use a map with an arrow function to extract $(this).data('id') from checkboxes and we got an array of undefined.

Function add(a, b){ return a + b } the above code snippet is the normal function to add two numbers.

// roots is now [1, 2, 3] // numbers is still [1, 4, 9] copy to clipboard. Const roots = numbers.map((num) => math.sqrt(num)); This is a very useful method because it is a very fast way to perform a quick transformation of elements. Arrow function is one of the features introduced in the es6 version of javascript.