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Lodash _.prototype.chain()用法及代碼示例


Lodash是一個JavaScript庫,可在underscore.js之上運行。 Lodash幫助處理數組,字符串,對象,數字等。

lodash中Sequence的_.prototype.chain()方法用於創建lodash包裝器的實例,並附帶啟用的顯式方法鏈序列。

用法:

_.prototype.chain()

參數:此方法不接受任何參數。

返回值:此方法返回新的lodash包裝器實例。



範例1:

Javascript

// Requiring lodash library 
const _ = require('lodash'); 
  
// Initializing authors variable 
var authors = [ 
  { 'author':'Nidhi', 'articles':750 }, 
  { 'author':'Nisha', 'articles':500 } 
]; 
   
// Calling chain() method and creating 
// an explicit chaining sequence 
let result = _(authors).chain() 
                       .tail() 
                       .value(); 
  
// Displays output                        
console.log(result);

輸出:

[ { author:'Nisha', articles:500 } ]

範例2:

Javascript

// Requiring lodash library 
const _ = require('lodash'); 
  
// Initializing authors variable 
var authors = [ 
  { 'author':'Nidhi', 'articles':750 }, 
  { 'author':'Nisha', 'articles':500 } 
]; 
   
// Calling chain() method and creating 
// an explicit chaining sequence 
let result = _(authors).chain() 
                       .head() 
                       .pick('articles') 
                       .value(); 
  
// Displays output                        
console.log(result);

輸出:

{ articles:750 }

範例3:

Javascript

// Requiring lodash library 
const _ = require('lodash'); 
   
// Calling chain() method and creating 
// an explicit chaining sequence 
let obj = _("GeeksforGeeks").chain().value(); 
  
// Displays output                        
console.log(obj[0]); 
console.log(obj[4]); 
console.log(obj[7]); 
console.log(obj[11]);

輸出:

G
s
r
k

參考: https://lodash.com/docs/4.17.15#prototype-chain

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注:本文由純淨天空篩選整理自nidhi1352singh大神的英文原創作品 Lodash _.prototype.chain() Method。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。