es6快速排序
es6快速排序
let qsort = fn =>([x,...xn]) => x == null ? []
: [
...qsort(fn)(xn.filter(a=>fn(a,x))),
x,
...qsort(fn)(xn.filter(a=>!fn(a,x)))
]
es5写法:
console.log(qsort((a,b)=>a<b)([110,765,-909,4432,-543]))
//[-909, -543, 110, 765, 4432]
var quickSort = function(arr) {
if (arr.length <= 1) {
return arr;
}
var pivotIndex = Math.floor(arr.length / 2);
var pivot = arr.splice(pivotIndex, 1)[0];
var left = [];
var right = [];
for (var i = 0; i < arr.length; i++) {
if (arr[i] < pivot) {
left.push(arr[i]);
} else {
right.push(arr[i]);
}
}
return quickSort(left).concat([pivot], quickSort(right));
};
console.log(quickSort(arr))