Commonly used algorithms in js projects

This time I will bring you commonly used algorithms in js projects. What are the precautions for using algorithms in js projects? Here are practical cases, let’s take a look.

Array deduplication

var arr = [1,2,3,4,4,2,2,6,9,1,0];var newArr = [];var onOff = true;for(var i = 0;i<arr.length;i++){
    onOff = true;    for(var j = 0;j<newArr.length;j++){        if(newArr[j]==arr[i]){
            onOff = false;
        }
    }    if(onOff){
        newArr.push(arr[i]);
    }
}console.log(newArr)

Shuffling algorithm

function shuffle(arr) {    var i = arr.length, t, j;    while (i) {
        j = Math.floor(Math.random() * i--);
        t = arr[i];
        arr[i] = arr[j];
        arr[j] = t;
    }    console.log(arr)
}var arr = [1, 3, 5, 7, 9]
shuffle(arr)

Write a function to count the most frequent characters in a string

var str = &#39;abcdefffdddddd&#39;;var obj={};for(var i=0;i<str.length;i++){    var t = str[i];    if(obj[t]){
        obj[t]++;
    }else{
        obj[t] = 1;
    }
}console.log(obj);var max=0,tKey;for(key in obj){    if(obj[key] > max){
        max = obj[key];
        tKey = key;
    }
}console.log(tKey)

I believe I have read it You have mastered the method in the case of this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Nuxt.js SSR permission verification use

How to use JS to achieve the simplest cross-domain

The above is the detailed content of Commonly used algorithms in js projects. For more information, please follow other related articles on the PHP Chinese website!