Underscore.js _.ternary() 方法
Underscore.js _.ternary()方法返回一个只接受三个参数的新函数,并将这些参数传递给给定的函数。给出的任何附加参数都将被丢弃。
句法:
_.ternary( fun )
参数:此方法接受如上所述和如下所述的单个参数:
- fun:这是应该用于参数的函数。
返回值:此方法返回一个新函数。
注意:此方法在普通 JavaScript 中不起作用,因为它需要安装underscore-contrib库。可以使用npm install underscore-contrib 安装
示例 1:
Javascript
// Defining underscore contrib variable
var _ = require('underscore-contrib');
// Function to be used
function fun() {
return arguments;
}
// Making ternary function
var gfgFunc = _.ternary(fun);
console.log("Arguments are :",
gfgFunc(1, 2, 3));
Javascript
// Defining underscore contrib variable
var _ = require('underscore-contrib');
// Function to be used
function fun() {
return arguments;
}
// Making the ternary function
var gfgFunc = _.ternary(fun);
// Arguments more than 3 are excluded
console.log("Arguments are :",
gfgFunc(1, 2, 3, 4, 5, 6, 7, 8));
Javascript
// Defining underscore contrib variable
var _ = require('underscore-contrib');
// Function to be used
function add() {
s=0;
for (i=0; i<3; i++) {
s+=arguments[i];
}
return s;
}
// Making the ternary function
var gfgFunc = _.ternary(add);
// Arguments more than 3 are excluded
console.log("Sum of first 3 arguments is :",
gfgFunc(1, 2, 3, 4, 5, 6, 7));
输出:
Arguments are : [Arguments] { '0': 1, '1': 2, '2': 3 }
示例 2:
Javascript
// Defining underscore contrib variable
var _ = require('underscore-contrib');
// Function to be used
function fun() {
return arguments;
}
// Making the ternary function
var gfgFunc = _.ternary(fun);
// Arguments more than 3 are excluded
console.log("Arguments are :",
gfgFunc(1, 2, 3, 4, 5, 6, 7, 8));
输出:
Arguments are : [Arguments] { '0': 1, '1': 2, '2': 3 }
示例 3:在此示例中,我们将添加参数,但只有前 3 个参数将使用此方法。
Javascript
// Defining underscore contrib variable
var _ = require('underscore-contrib');
// Function to be used
function add() {
s=0;
for (i=0; i<3; i++) {
s+=arguments[i];
}
return s;
}
// Making the ternary function
var gfgFunc = _.ternary(add);
// Arguments more than 3 are excluded
console.log("Sum of first 3 arguments is :",
gfgFunc(1, 2, 3, 4, 5, 6, 7));
输出:
Sum of first 3 arguments is : 6