Created
September 26, 2017 16:52
-
-
Save teffcode/1f26c3b754422031818eb7ee3caffc4e to your computer and use it in GitHub Desktop.
Array_Methods
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
* FROM -> crea una nueva instancia de array | |
*/ | |
// 1 | |
Array.from("tefa") // ["t", "e", "f", "a"] | |
// 2 | |
function formArrayLike() { | |
return Array.from(arguments) | |
} | |
formArrayLike(1, 2, 3) // [1, 2, 3] | |
/* | |
* IS ARRAY -> determina si el valor es un array | |
*/ | |
// 1 | |
Array.isArray([1,2]) // true | |
Array.isArray(Array.prototype) // true | |
Array.isArray({tefa: 2}) // false | |
/* | |
* ARRAY OF -> crea una nueva instancia de array | |
*/ | |
Array.of("tefa") // ["tefa"] | |
/* | |
* CONCAT -> unir dos o más arreglos | |
*/ | |
// 1 | |
var a = [1, 2, 3] | |
var b = [4, 5, 6] | |
var ab = a.concat(b) // ab = [1, 2, 3, 4, 5, 6] | |
/* | |
* COPY WITHIN -> hace una copia de los elementos del arr | |
*/ | |
// el (-2) es de atrás para adelante y desde ahí empieza a copiar | |
[1, 2, 3, 4, 5].copyWithin(-2) // [1, 2, 3, 1, 2] | |
// (-3) -> desde donde empieza a copiar | |
// (1) -> desde que posición hace la copia | |
// (-2) -> hasta donde copia | |
[1, 2, 3, 4, 5].copyWithin(-3, 1, -2) // [1, 2, 2, 3, 5] | |
/* | |
* EVERY -> retorna booleano al probar una función por cada elemento del array | |
*/ | |
[1, 2, 3].every((c) => c<5) // true | |
/* | |
* FILL -> rellena los elementos de un array | |
*/ | |
Array(4).fill(5) // [5, 5, 5, 5] | |
[1, 2, 3, 4].fill(3, 1, 3) // [1, 3, 3, 4] |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment