freeCodeCamp Challenge Guide: Use the Spread Operator to Evaluate Arrays In-Place

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Use the Spread Operator to Evaluate Arrays In-Place

Relevant Links

• Spread Operator

• Spread Operator compared to Rest Parameter

...spread operator and rest operator - Beau teaches JavaScript

• 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 

arr2 = [...arr1];  // Change this line

console.log(arr2);

Code Explanation

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