如何实现一个 sampleSize 函数，从数组中随机取N个元素
Issue 欢迎在 Gtihub Issue 中回答此问题: Issue 696 (opens in a new tab)
Author 回答者: shfshanyue (opens in a new tab)
const shuffle = (list) => list.sort((x, y) => Math.random() - 0.5);
const sampleSize = (list, n) => shuffle(list).slice(0, n);Author 回答者: voezy (opens in a new tab)
Array.prototype.sampleSie = function (size) {
const result = [];
const tmp = [...this];
const len = tmp.length;
for (let i = 0; i < size && i < len; i++) {
const index = Math.floor(Math.random() * tmp.length);
result[i] = tmp.splice(index, 1)[0];
}
return result;
};Author 回答者: rujptw (opens in a new tab)
不知道这样可不可以，从随机挑选的数，组成的数组，长度达到size，就返回
function sampleSize(array,size){
let len = array.length,i,pickArr = [];
while(len&&size){
i = Math.floor(Math.random()*len);
len--;
pickArr.push(array.splice(i,1)[0]);
size--;
}
return pickArr
}