¿Cómo puedo barajar una matriz? [duplicar]
Posible Duplicado:
Cómo aleatorizar una matriz de javascript?
Quiero barajar una matriz de elementos en JavaScript como estos:
[0, 3, 3] -> [3, 0, 3]
[9, 3, 6, 0, 6] -> [0, 3, 6, 9, 6]
[3, 3, 6, 0, 6] -> [0, 3, 6, 3, 6]
344
2 answers
Use la versión moderna del algoritmo de shuffle de Fisher–Yates :
/**
* Shuffles array in place.
* @param {Array} a items An array containing the items.
*/
function shuffle(a) {
var j, x, i;
for (i = a.length - 1; i > 0; i--) {
j = Math.floor(Math.random() * (i + 1));
x = a[i];
a[i] = a[j];
a[j] = x;
}
return a;
}
Versión ES2015 (ES6)
/**
* Shuffles array in place. ES6 version
* @param {Array} a items An array containing the items.
*/
function shuffle(a) {
for (let i = a.length - 1; i > 0; i--) {
const j = Math.floor(Math.random() * (i + 1));
[a[i], a[j]] = [a[j], a[i]];
}
return a;
}
Tenga en cuenta, sin embargo, que el intercambio de variables con la asignación de desestructuración causa una pérdida de rendimiento significativa, a partir de octubre de 2017.
Use
var myArray = ['1','2','3','4','5','6','7','8','9'];
shuffle(myArray);
728
Author: Jeff,
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2018-04-13 23:19:05
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2018-04-13 23:19:05
Podría usar el Fisher-Yates Shuffle (código adaptado de este sitio):
function shuffle(array) {
let counter = array.length;
// While there are elements in the array
while (counter > 0) {
// Pick a random index
let index = Math.floor(Math.random() * counter);
// Decrease counter by 1
counter--;
// And swap the last element with it
let temp = array[counter];
array[counter] = array[index];
array[index] = temp;
}
return array;
}
435
Author: Blender,
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2016-02-25 17:01:36
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2016-02-25 17:01:36