JavaScript shorthand techniques reproduced continuous handling, aspects of their own view

Tips on some JavaScript, reproduced from HTTPS://WWW.GEEKJC.COM/POST/5A0A8C9A592E38541F7703C8.

The 1IF statement can be abbreviated with a three-mesh operation:

const x = 20;

if (x > 10) {

} else {
Answer = ' less than 10 ';
}

Const ANSWER = x > 10? ' Greater than ': ' less than 10 ';

　　

2. String concatenation:

var arr = [{    "name": "Dachun",    "age": +, "    sex": "Male"       }];for (Let i = 0;i<arr.length;i++) {    Console.log ("Name:" + Arr[i].name + "Age:" + Arr[i].age + "Gender:" + Arr[i].sex);} 　　ES6 string concatenation: for (Let i = 0;i<arr.length;i++) {console.log (' Name: ${arr[i].name} Age: ${arr[i].age} Gender: ${arr[i].sex} '); }//Note: In the ' Write variable, the ESC key below the English state can be pressed out '

　

3. Arrow functions

function SayHello (name) {  console.log (' Hello ', name);} SetTimeout (function () {  console.log (' Loaded ')}, () List.foreach (function (item) {  Console.log (item);}); /with arrow function shorthand:  SayHello = name + console.log (' Hello ', name);  SetTimeout (() = Console.log (' Loaded ');  List.foreach (item = Console.log (item));

　

4, the array to go to the weight (the key qaq the question several times have this)

var arr = [1, 1, 2, 2, 3, 3];                     function Unique (arr) {let    res = [];    for (var i = 0;i<arr.length;i++) {for (var j = 0; j<res.length;j++) {    if (arr[i] = = = Res[j]) {break;    }}　　if (j = = = Res.length) {    res.push (arr[i]);}   } return res; }console.log (arr);             Es6 Set method function unique (arr) {return array.from (new Set (arr));   } Console.log ("Es6set method:", Unique (arr));    

　　

　　

JavaScript shorthand techniques reproduced continuous handling, aspects of their own view