typescript 打字稿中的对象平等
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Object Equality in Typescript
提问by Hui Wang
I'm creating a lib on vectors in typescript. My very first test failed:).
我正在打字稿中的向量上创建一个库。我的第一次测试失败了:)。
It's related to object equality in TypeScript/JavaScript but I can't find a way to make the test green. No object equality is mentioned in typescript's official doc http://www.typescriptlang.org/Handbook#classes.
它与 TypeScript/JavaScript 中的对象相等性有关，但我找不到使测试变绿的方法。typescript 的官方文档http://www.typescriptlang.org/Handbook#classes 中没有提到对象相等。
Could someone please give me a hand ?
有人可以帮我一把吗？
This is the source code.
这是源代码。
class Vector {
x: number;
y: number;
constructor(x: number, y: number) {
this.x = x;
this.y = y;
}
add(that: Vector) {
return new Vector(this.x + that.x, this.y + that.y);
}
}
export = Vector;
Then I have a unit test on this class as follows
然后我对这个类进行了单元测试，如下所示
var Vector = require("../lib/vector")
describe("vector", function () {
it("should add another vector", function () {
var v1 = new Vector(1, 1);
var v2 = new Vector(2, 3);
expect(v1.add(v2)).toEqual(new Vector(3, 4));
});
});
When executed obtains the following error
执行时出现如下错误
Failures:
1) vector should add another vector
1.1) Expected Vector({ x: 3, y: 4 }) to be Vector({ x: 3, y: 4 }).
采纳答案by Aaron Beall
Your test case should work. Here it is passing on jsfiddle.
您的测试用例应该可以工作。在这里它传递 jsfiddle。
However, it seems your actual code was using toBe()instead of toEqual(), since the failure message says "to be"and not "to equal":
但是，您的实际代码似乎正在使用toBe()而不是toEqual()，因为失败消息说"to be"而不是"to equal"：
Expected Vector({ x: 3, y: 4 }) to beVector({ x: 3, y: 4 }).
预期 Vector({ x: 3, y: 4 })为Vector({ x: 3, y: 4 })。
Using toBe()will check that the identity of the two objects are the same (ie ===), which they obviously are not. You definitely want toEqual()which does a deep comparison of values.
UsingtoBe()将检查两个对象的身份是否相同（即===），而它们显然不是。您肯定想要toEqual()对值进行深入比较。
回答by basarat
TypeScript object equality is the same as JavaScript object equality. This is because TypeScript is just JavaScript.
TypeScript 对象相等性与 JavaScript 对象相等性相同。这是因为TypeScript 只是 JavaScript。
