es6 array function map function with arrow code example
Example 1: array map arrow function
materials.map((str) => {
const {length} = str;
return length;
});
Example 2: pass a variable by reference to arrow function
// Parenthesize the body of a function to return an object literal expression:
params => ({foo: bar})
// Rest parameters and default parameters are supported
(param1, param2, ...rest) => { statements }
(param1 = defaultValue1, param2, …, paramN = defaultValueN) => {
statements }
// Destructuring within the parameter list is also supported
var f = ([a, b] = [1, 2], {x: c} = {x: a + b}) => a + b + c;
f(); // 6