.sort(function(a,b){return a-b});

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.sort(function(a,b){return a-b});

var points = [40,100,1,5,25,10]; var b= points.sort(function(a,b){return a-b}); console.log(b); 那个function的作用就是比较两个数的大小用的,然后返回结果的正负作为排序的依据. 这个函数是升序排序,如果想逆序排序改成return b-a;就行了.它的排序原理是每2个数比较,然后根据正负更改数组内元素的位置.比如第一次比较,a就是888,b就是2222然后返回888-2222 是负的位置不变.你…

[Javascript] Use a custom sort function on an Array in Javascript

Sorting in Javascript with sort uses lexical sorting by default, which means it will sort in alphabetical order. That's fine for strings of characters, but it means that arrays of numbers don't sort in numerical order! To fix that, we'll pass a custo…

console.log((function f(n){return ((n > 1) ? n * f(n-1) : n)})(5))调用解析

console.log((function f(n){) ? n * f(n-) : n)})()); 5被传入到函数,函数内部三元计算,5 > 1成立,运算结果是5*f(4),二次运算,5*4*f(3),依次类推,最终是5*4*3*2,最终返回结果是120. 如图:…

Flask - 访问返回字典的接口报错：The view function did not return a valid response. The return type must be a string, tuple, Response instance, or WSGI callable, but it was a dict.

背景有一个 Flask 项目,然后有一个路由返回的是 dict 通过浏览器访问,结果报错关键报错信息 TypeError: 'dict' object is not callable The view function did not return a valid response. The return type must be a string, tuple, Response instance, or WSGI callable, but it was a dict. 意思是不能返回…

[C++] - GCC和LLVM对方法 warning: non-void function does not return a value [-Wreturn-type] 的处理差异

最近做一个C++开源项目发现一个奇怪问题,通过clang编译链接执行程序每到有一个就崩溃了,gcc下则没有此问题. 后来通过调试,发现原因是bool返回的方法是没有return语句!问题是为啥还能通过编译呢? 列子如下: #include <iostream> class Test { public: bool yes(); }; bool Test::yes() { std::cout << "yes" << std::endl; // retur…

Interview Sort Function

QuickSort Java Code: import java.util.*; public class quickSort{ public static void main(String [] args){ int [] arr = new int[]{4,2,7,5,0,9,1}; int low = 0; int high = arr.length-1; quickSort(arr, low, high); System.out.println(Arrays.toString(arr))…