JS Spread Operator

spread.js

// source : https://www.sitepoint.com/javascript-spread-operator/

const evenNumbers = [2, 4, 6, 8];
const oddNumbers = [1, 3, 5, 7];
const allNumbers = [...evenNumbers, ...oddNumbers];
console.log(...allNumbers); //[2, 4, 6, 8, 1, 3, 5, 7]

const obj1 = { name: 'Mark', age: 20};
const obj2 = { age: 30 };
const clonedObj = { ...obj1, ...obj2 };
console.log(clonedObj); // {name: 'Mark', age: 30}

const str = 'Hello, World!';
const obj = { ...str };
console.log(obj); // {0: 'H', 1: 'e', 2: 'l', 3: 'l', 4: 'o', 5: ',', 6: ' ', 7: 'W', 8: 'o', 9: 'r', 10: 'l', 11: 'd', 12: '!'}

const str = 'Hello, World!';
const strArr = [...str];
console.log(strArr); // ['H', 'e', 'l', 'l', 'o', ',', ' ', 'W', 'o', 'r', 'l', 'd', '!']

const numbers = [15, 13, 100, 20];
const clonedNumbers = [...numbers];
clonedNumbers.push(24);
console.log(clonedNumbers); // [15, 13, 100, 20, 24]
console.log(numbers); // [15, 13, 100, 20]

const duplicatesArr = [1, 2, 3, 2, 1, 3];
const uniqueArr = [...new Set(duplicatesArr)];
console.log(duplicatesArr); // [1, 2, 3, 2, 1, 3]
console.log(uniqueArr); // [1, 2, 3]

function calculateSum(...funcArgs) {
  let sum = 0;
  for (const arg of funcArgs) {
    sum += arg;
  }

  return sum;
}