how to add another function value in an array javascript code example

Example 1: javascript array push

let animals = ["dog","cat","tiger"];

animals.pop(); // ["dog","cat"]

animals.push("elephant"); // ["dog","cat","elephant"]

Example 2: array.push

var vegetables = ['Capsicum',' Carrot','Cucumber','Onion'];
vegetables.push('Okra');
//expected output ['Capsicum',' Carrot','Cucumber','Onion','Okra']; 
// .push adds a thing at the last of an array