Rewriting array elements in JavaScript
You can also read the current value of an element, perform some operation on it, and write the changed value back to that element:
let arr = ['a', 'b', 'c'];
arr[0] = arr[0] + '!';
arr[1] = arr[1] + '!';
arr[2] = arr[2] + '!';
console.log(arr); // shows ['a!', 'b!', 'c!']
The previous code can be rewritten
using the operator +=:
let arr = ['a', 'b', 'c'];
arr[0] += '!';
arr[1] += '!';
arr[2] += '!';
console.log(arr); // shows ['a!', 'b!', 'c!']
Create an array with numbers.
Add the number 3 to each
element of the array. Display
the modified array on the screen.
