spread operator shorthand javascript
// Spread Operator Shorthand javascript // Longhand // joining arrays const odd = [1, 3, 5]; const nums = [2 ,4 , 6].concat(odd); console.log(nums); // [ 2, 4, 6, 1, 3, 5 ] // cloning arrays const arr = [1, 2, 3, 4]; const arr2 = arr.slice() console.log(arr2); // [ 1, 2, 3, 4 ] // Shorthand: // joining arrays const odd_ = [1, 3, 5 ]; const nums_ = [2 ,4 , 6, ...odd_]; //spread operator is simply a series of three dots. console.log(nums_); // [ 2, 4, 6, 1, 3, 5 ] // cloning arrays const arr_ = [1, 2, 3, 4]; const arr2_ = [...arr_]; console.log(arr2_); // [ 1, 2, 3, 4 ] // Unlike the concat() function, you can use the spread operator to insert an array anywhere inside another array. const odd__ = [1, 3, 5 ]; const nums__ = [2, ...odd__, 4 , 6]; console.log(nums__); // [ 2, 1, 3, 5, 4, 6 ] // You can also combine the spread operator with ES6 destructuring notation: const { a, b, ...z } = { a: 1, b: 2, c: 3, d: 4 }; console.log(a) // 1 console.log(b) // 2 console.log(z) // { c: 3, d: 4 }