TypeScript：将布尔值转换为字符串值
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TypeScript: Convert a bool to string value
提问by Ucodia
I have a really simple issue, I can't get to convert a simple boolean to a string valuein TypeScript.
我有一个非常简单的问题，我无法在 TypeScript 中将简单的布尔值转换为字符串值。
I have been roaming throught documentation and I could not find anything helpful and of course I tried to use the toString()method but it does not seem to be implemented on bool.
我一直在浏览文档，但找不到任何有用的东西，当然我尝试使用该toString()方法，但它似乎没有在 bool 上实现。
Edit: I have almost no JavaScript knowledge and came to TypeScript with a C#/Java background.
编辑：我几乎没有 JavaScript 知识，并以 C#/Java 背景来到 TypeScript。
回答by Fenton
This is either a bug in TypeScript or a concious design decision, but you can work around it using:
这要么是 TypeScript 中的一个错误，要么是一个有意识的设计决策，但您可以使用以下方法解决它：
var myBool: bool = true;
var myString: string = String(myBool);
alert(myString);
In JavaScript booleans override the toStringmethod, which is available on any Object(pretty much everything in JavaScript inherits from Object), so...
在 JavaScript 中，布尔值覆盖了该toString方法，该方法可用于任何Object（JavaScript 中的几乎所有内容都继承自Object），所以......
var myString: string = myBool.toString();
... should probably be valid.
...应该是有效的。
There is also another work around for this, but I personally find it a bit nasty:
还有另一种解决方法，但我个人觉得它有点讨厌：
var myBool: bool = true;
var myString: string = <string><any> myBool;
alert(myString);
回答by Jon Black
For those looking for an alternative, another way to go about this is to use a template literallike the following:
对于那些正在寻找替代方案的人，另一种方法是使用如下所示的模板文字：
const booleanVal = true;
const stringBoolean = `${booleanVal}`;
The real strength in this comes if you don't know for sure that you are getting a boolean value. Although in this question we know it is a boolean, thats not always the case, even in TypeScript(if not fully taken advantage of).
如果您不确定您正在获得一个布尔值，那么这方面的真正优势就来了。尽管在这个问题中我们知道它是一个布尔值，但情况并非总是如此，即使在 TypeScript 中（如果没有充分利用）。
回答by Tolga
One approach is to use the Ternary operator:
一种方法是使用三元运算符：
myString = myBool? "true":"false";
回答by Luca C.
This if you have to handle null values too:
如果您也必须处理空值，请执行此操作：
stringVar = boolVar===null? "null" : (boolVar?"true":"false");
