Preview:
const concept = ['arrays', 'can', 'be', 'mutated'];

function changeArr(arr){
  arr[3] = 'MUTATED';
}

changeArr(concept);

console.log(concept);

const removeElement = newArr => {
  newArr.pop()
};

removeElement(concept);

console.log(concept);
downloadDownload PNG downloadDownload JPEG downloadDownload SVG

Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter