freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/es6/use-the-spread-operator-to-evaluate-arrays-in-place/index.md

title

title
Use the Spread Operator to Evaluate Arrays In-Place

Use the Spread Operator to Evaluate Arrays In-Place

Relevant Links

• Spread Operator

• Spread Operator compared to Rest Parameter

• ideo Explaining Spread Operator and Rest Parameter

• Apply Method

Examples

let numbers = [-12, 160, 0, -3, 51];
let minNum = Math.min.apply(null, numbers);
console.log(minNum); //-12

let numbers = [-12, 160, 0, -3, 51];
let minNum = Math.min(numbers);
console.log(minNum); //NaN

let numbers = [-12, 160, 0, -3, 51];
let minNum = Math.min(...numbers);
console.log(minNum); //-12

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Solutions

const arr1 = ["JAN", "FEB", "MAR", "APR", "MAY"];
let arr2;
(function() {
  "use strict";
  arr2 = [...arr1]; // change this line
})();
console.log(arr2);

Code Explanation

• Unpacking the arr1 using the spread operator and then copying those values to arr2