The unshift() method adds a new element to an array (at the beginning), and "unshifts" older elements.
<button onclick="unshiftElement()">Unshift Element</button>
<p id="demo"></p>
<script>
var courses = ["javascript", "php", "angularjs", "node js"];
document.getElementById("demo").innerHTML = courses;
function unshiftElement() {
var shifted_element = courses.unshift("Mongo DB");
console.log(shifted_element);
document.getElementById("demo").innerHTML = courses;
}
</script> ...