Lodash _.not() 方法
Lodash _.not() 方法返回一个布尔值,它与给定值的真实性布尔值相反。
句法:
_.not( value );
参数:此方法采用一个参数,如上所述,如下所述:
- value:返回相反布尔值的给定值。
返回值:此方法返回一个布尔值。
注意:这在普通 JavaScript 中不起作用,因为它需要安装 lodash.js contrib 库。 Lodash.js contrib 库可以使用npm install lodash-contrib –save 安装。
示例 1:
Javascript
// Defining lodash contrib variable
var _ = require('lodash-contrib');
var bool = _.not( true );
console.log("Opposite boolean value 'true' is : ", bool);
var bool = _.not( false );
console.log("Opposite boolean value 'false' is : ", bool);
Javascript
// Defining lodash contrib variable
var _ = require('lodash-contrib');
var bool = _.not( 0 );
console.log("Opposite boolean value '0' is : ", bool);
var bool = _.not( 1 );
console.log("Opposite boolean value '1' is : ", bool);
var bool = _.not( 10 );
console.log("Opposite boolean value '10' is : ", bool);
Javascript
// Defining lodash contrib variable
var _ = require('lodash-contrib');
var bool = _.not( {} );
console.log("Opposite boolean value empty object is : ", bool);
var bool = _.not( {'G' : "GeeksforGeeks"} );
console.log("Opposite boolean value object is : ", bool);
var bool = _.not( null );
console.log("Opposite boolean value 'null' is : ", bool);
输出:
Opposite boolean value 'true' is : false
Opposite boolean value 'false' is : true
示例 2:
Javascript
// Defining lodash contrib variable
var _ = require('lodash-contrib');
var bool = _.not( 0 );
console.log("Opposite boolean value '0' is : ", bool);
var bool = _.not( 1 );
console.log("Opposite boolean value '1' is : ", bool);
var bool = _.not( 10 );
console.log("Opposite boolean value '10' is : ", bool);
输出:
Opposite boolean value '0' is : true
Opposite boolean value '1' is : false
Opposite boolean value '10' is : false
示例 3:
Javascript
// Defining lodash contrib variable
var _ = require('lodash-contrib');
var bool = _.not( {} );
console.log("Opposite boolean value empty object is : ", bool);
var bool = _.not( {'G' : "GeeksforGeeks"} );
console.log("Opposite boolean value object is : ", bool);
var bool = _.not( null );
console.log("Opposite boolean value 'null' is : ", bool);
输出:
Opposite boolean value empty object is : false
Opposite boolean value object is : false
Opposite boolean value 'null' is : true