js elimina el primer elemento de la matriz
var arr = [1,2,3];
arr.shift() // removes and return first element
Yanislav Ivanov
var arr = [1,2,3];
arr.shift() // removes and return first elementvar myarray = ["item 1", "item 2", "item 3", "item 4"];
//removes the first element of the array, and returns that element.
alert(myarray.shift());
//alerts "item 1"
//removes the last element of the array, and returns that element.
alert(myarray.pop());
//alerts "item 4"var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.shift();
// var fruits = ["Orange", "Apple", "Mango"];var colors = ["red", "blue", "green"]
var firstColor = colors.shift()
console.log(firstColor) // red
console.log(colors) // blue green// remove the first element with shift
let flowers = ["Rose", "Lily", "Tulip", "Orchid"];
// assigning shift to a variable is not needed if
// you don't need the first element any longer
let removedFlowers = flowers.shift();
console.log(flowers); // ["Lily", "Tulip", "Orchid"]
console.log(removedFlowers); // "Rose"var arr = [1, 2, 3, 4];
var theRemovedElement = arr.shift(); // theRemovedElement == 1
console.log(arr); // [2, 3, 4]