How to replace elements in array with elements of another array in JavaScript?

To replace elements with elements of another array, use splice(). Following is the code −

Example

var values = ['John', 'David', 'Bob', 'Mike', 'Sam', 'Carol', 'Adam'];
var marks = [55, 78, 90];
Array.prototype.splice.apply(values, [0, marks.length].concat(marks));
console.log(values);

To run the above program, you need to use the following command −

node fileName.js.

Here, my file name is demo303.js.

Output

This will produce the following output −

PS C:\Users\Amit\javascript-code> node demo303.js
[ 55, 78, 90, 'Mike', 'Sam', 'Carol', 'Adam' ]