To change all elements of an array, you can use various array methods that modify the original array. Here are some examples:
1. Using the fill() method:
const arr = [1, 2, 3, 4];
arr.fill(0);
console.log(arr); // Output: [0, 0, 0, 0]
In the example above, the
fill() method replaces all elements of the arr array with 0.
2. Using the map() method:
const arr = [1, 2, 3, 4];
const newArr = arr.map(item => item * 2);
console.log(newArr); // Output: [2, 4, 6, 8]
In the example above, the
map() method creates a new array (newArr) with all elements of the arr array multiplied by 2.
3. Using the forEach() method:
const arr = [1, 2, 3, 4];
arr.forEach((item, index) => {
arr[index] = item * 2;
});
console.log(arr); // Output: [2, 4, 6, 8]
In the example above, the
forEach() method iterates over each element of the arr array and multiplies it by 2. The updated values are then assigned back to the arr array using the index parameter.
Note that each of these methods modifies the original array, so be careful when using them in your code.