Lodash是一個JavaScript庫,可在underscore.js頂部使用。 Lodash幫助處理數組,集合,字符串,對象,數字等。
_.partition()方法創建一個分為兩個組的元素數組,其中第一個包含謂詞返回true的元素,第二個包含謂詞返回false的元素。
用法:
_.partition(collection, predicate)
參數:該方法接受上述和以下所述的兩個參數:
- collection:此參數保留要迭代的集合。
- predicate:此參數保存每次迭代調用的函數,並使用一個參數(值)調用
返回值:此方法返回分組元素的數組。
範例1:在這裏,const _ = require(‘lodash’)用於將lodash庫導入文件中。
// Requiring the lodash library
const _ = require("lodash");
// Original array
var users = [
{ 'customer':'john', 'age':26, 'active':false },
{ 'customer':'jonny', 'age':34, 'active':true },
{ 'customer':'johnson', 'age':12, 'active':false }
];
// Use of _.partition() method
let gfg = _.partition(users, function(o) { return
o.active; });
// Printing the output
console.log(gfg);
輸出:
[ [ { customer:'jonny', age:34, active:true }, { customer:'john', age:26, active:false }, { customer:'johnson', age:12, active:false } ] ]
範例2:
// Requiring the lodash library
const _ = require("lodash");
// Original array
var users = [
{ 'customer':'john', 'age':26, 'active':false },
{ 'customer':'jonny', 'age':34, 'active':true },
{ 'customer':'johnson', 'age':12, 'active':false }
];
// Use of _.partition() method
// The `_.matches` iteratee shorthand
let gfg = _.partition(users, { 'age':12, 'active':false
});
// Printing the output
console.log(gfg);
輸出:
[ [ { customer:'johnson', age:12, active:false } ], [ { customer:'john', age:26, active:false }, { customer:'jonny', age:34, active:true } ] ]
範例3:
// Requiring the lodash library
const _ = require("lodash");
// Original array
var users = [
{ 'customer':'john', 'age':26, 'active':false },
{ 'customer':'jonny', 'age':34, 'active':true },
{ 'customer':'johnson', 'age':12, 'active':false }
];
// Use of _.partition() method
// The `_.matchesProperty` iteratee shorthand
let gfg = _.partition(users, ['active', false]);
// Printing the output
console.log(gfg);
輸出:
[ [ { customer:'john', age:26, active:false }, { customer:'johnson', age:12, active:false } ], [ { customer:'jonny', age:34, active:true } ] ]
範例4:
// Requiring the lodash library
const _ = require("lodash");
// Original array
var users = [
{ 'customer':'john', 'age':26, 'active':false },
{ 'customer':'jonny', 'age':34, 'active':true },
{ 'customer':'johnson', 'age':12, 'active':false }
];
// Use of _.partition() method
// The `_.matches` iteratee shorthand
let gfg = _.partition(users, { 'age':12, 'active':false
});
// Printing the output
console.log(gfg);
輸出:
[ [ { customer:'johnson', age:12, active:false } ], [ { customer:'jonny', age:34, active:true }, { customer:'john', age:26, active:false } ] ]
注意:該代碼在常規JavaScript中不起作用,因為它需要安裝庫lodash。
相關用法
- Underscore.js _.partition()用法及代碼示例
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注:本文由純淨天空篩選整理自shivanisinghss2110大神的英文原創作品 Lodash _.partition() 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。