Variables (let, const, var), Array Methods, Destructuring Arrays and Objects - Features of ECMA 6
Features:
Vaariables
Variables
with ES6, there are three ways of defining your variables: var, let, and const.
var x = 5.6;
var has a function scope, not a block scope.
let x = 5.6;
let is the block scoped version of var, and is limited to the block (or expression) where it is defined.
const x = 5.6;
const is a variable that once it has been created, its value can never change.
const has a block scope.
Array Methods
One of the most useful in React is the .map() array method.
The .map() method allows you to run a function on each item in the array, returning a new array as the result.
In React, map() can be used to generate lists.
Destructuring
To illustrate destructuring, we'll make a sandwich. Do you take everything out of the refrigerator to make your sandwich? No, you only take out the items you would like to use on your sandwich.
Destructuring is exactly the same. We may have an array or object that we are working with, but we only need some of the items contained in these.
Destructuring makes it easy to extract only what is needed
#ecmascript6
#webdevelopment
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