Metodos de array

push()

Agrega un item

var people = ["John", "Mary", "Anny"]

people.push("Leo");

console.log(people);

pop()

Quita el ultimo item

var people = ["John", "Mary", "Anny", "leo"]

people.pop():


console.log(people);

["John", "Mary", "Anny"]


Shift()

Quita el primer  item

var people = ["John", "Mary", "Anny", "leo"]

people.shift():


console.log(people);

 ["Mary", "Anny", "leo"]

unshift()

Agrega un item al principio del array

var people = ["Mary", "Anny", "leo"]

people.unshift("John",):

["John", "Mary", "Anny", "leo"]


reverse()

cambia el orden  del arreglo
var people = ["Mary", "Anny", "leo"]

people.reverse():

 [ "leo", "Anny","Mary"]


Array.isArray();

devuelve tru o false si es una rreglo

var myArray1 ="Elvio";
var myArray2 = [0,1,2,3,4,5];

console.log(Array.isArray(myArray1));  //false

console.log(Array.isArray(myArray2)); //true

ejemplos que regresan false

console.log(Array.isArray({}));
console.log(Array.isArray(null));
console.log(Array.isArray(undefined));
console.log(Array.isArray(17));
console.log(Array.isArray('array'));
console.log(Array.isArray(true));


slice()

Extrae elementos

var people = ["Mary", "Anny", "leo","Leonard"];
console.log( people.slice(0,2));  // ["Marck", "Mary"];