insert array inside arrya js code example

Example 1: javascript add array to array at index

a1.splice(2, 0, ...a2);

Example 2: how to make and add to an array in javascript

var arrayExample = [53,'Hello World!'];
console.log(arrayExample) //Output =>
[53,'Hello World!']

//You can also do this
arrayExample.push(true);

console.log(arrayExample); //Output =>
[53,'Hello World!',true];