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
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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。