how to remove the first value of an array in javascript code example

Example 1: javascript remove first element from array

var arr = [1, 2, 3, 4]; 
var theRemovedElement = arr.shift(); // theRemovedElement == 1
console.log(arr); // [2, 3, 4]

Example 2: javascript pop first element

pop(): Remove an item from the end of an array.
push(): Add items to the end of an array.
shift(): Remove an item from the beginning of an array.
unshift(): Add items to the beginning of an array.