node . js util . types . is generator function()方法
原文:https://www . geesforgeks . org/node-js-util-types-is generator function-method/
util . types . IsGeneratorFunction()方法是 util 模块的内置应用编程接口,主要是为了支持 Node.js 自身内部 API 的需求而设计的。 使用util . types . is generator function()方法检查给定值是否是一个发生器函数。
语法:
util.types.isGeneratorFunction( value )
参数:该函数接受一个参数,如上所述,如下所述:
- 值:这是将为发电机功能检查的值。
返回值:如果传递的值是生成器函数,则返回布尔值,即真,否则返回假。
下面的程序说明了 Node.js 中的util . types . is generator function()方法:
例 1:
Node.js
// Node.js program to demonstrate the
// util.types.isGeneratorFunction() method
// Import the util module
const util = require('util');
// Getting the generator function
let GeneratorFunction =
Object.getPrototypeOf(function*(){}).constructor
// Checking the generator function
let genFn = new GeneratorFunction();
console.log(genFn);
isGenFn = util.types.isGeneratorFunction(genFn);
console.log("Object is a generator function:", isGenFn);
// Checking a normal function
let normalFn = function helloWorld() {};
console.log(normalFn);
isGenFn = util.types.isGeneratorFunction(normalFn);
console.log("Object is a generator function:", isGenFn);
输出:
[GeneratorFunction: anonymous]
Object is a generator function: true
[Function: helloWorld]
Object is a generator function: false
例 2:
Node.js
// Node.js program to demonstrate the
// util.types.isGeneratorFunction() method
// Import the util module
const util = require('util');
// Checking a generator function
let genFn = function* getID() {
let id = 0;
while (true)
yield id++;
};
console.log(genFn);
isGenFn = util.types.isGeneratorFunction(genFn);
console.log("Object is a generator function:", isGenFn);
// Checking a normal function
let normalFn = function helloGeeks() {
console.log("Hello World")
};
console.log(normalFn);
isGenFn = util.types.isGeneratorFunction(normalFn);
console.log("Object is a generator function:", isGenFn);
输出:
[GeneratorFunction: getID]
Object is a generator function: true
[Function: helloGeeks]
Object is a generator function: false
参考:T2】https://nodejs . org/API/util . html # util _ util _ types _ isgenerator function _ value
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