how to remove first element of array in javascript

var arr = [1, 2, 3, 4]; 
var theRemovedElement = arr.shift(); // theRemovedElement == 1
console.log(arr); // [2, 3, 4]var colors = ["red", "green", "blue"];
var red=colors.shift();
//colors is now ["green","blue"];let numbers = ["I'm Not A Number!", 1, 2, 3];
numbers.shift();