我如何检查一个数组是否包含TypeScript中的字符串?

Currently I am using Angular 2.0. I have an array as follows:

目前我使用的是角2。0。我有如下数组:

var channelArray: Array<string> = ['one', 'two', 'three'];

How can I check in TypeScript whether the channelArray contains a string 'three'?

我如何检查打字稿中channelArray是否包含一个字符串“three”?

3 个解决方案

#1

The same as in JavaScript, using Array.prototype.indexOf():

与JavaScript相同，使用Array.prototype.indexOf():

console.log(channelArray.indexOf('three') > -1);

Or using ECMAScript 6 Array.prototype.includes():

或使用ECMAScript 6 Array.prototype.includes():

console.log(channelArray.includes('three'));

#2

You can use the some method:

你可以使用一些方法:

console.log(channelArray.some(x => x === "three")); // true

You can use the find method:

你可以使用查找方法:

console.log(channelArray.find(x => x === "three")); // three

Or you can use the indexOf method:

或者你可以使用indexOf方法:

console.log(channelArray.indexOf("three")); // 2

#3

console.log("three" in channelArray) // this will return a boolean value.

控制台。log(“3”在channelArray中)//这将返回一个布尔值。