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LibJS: Implement Function.prototype.bind() according to the spec :^)

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This commit is contained in:
Linus Groh 2022-02-09 19:41:23 +00:00
parent 87b9fa2636
commit 898ad7c682
4 changed files with 66 additions and 20 deletions
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16
Userland/Libraries/LibJS/Tests/builtins/Function/Function.prototype.bind.js
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@ -33,6 +33,20 @@ describe("basic behavior", () => {
)
).toBe(12);
});
test("name has 'bound' prefix", () => {
function foo() {}
const boundFoo = foo.bind(123);
expect(foo.name).toBe("foo");
expect(boundFoo.name).toBe("bound foo");
});
test("prototype is inherited from target function", () => {
function foo() {}
Object.setPrototypeOf(foo, Array.prototype);
const boundFoo = Function.prototype.bind.call(foo, 123);
expect(Object.getPrototypeOf(boundFoo)).toBe(Array.prototype);
});
});
describe("bound function arguments", () => {
@ -144,6 +158,6 @@ describe("errors", () => {
test("does not accept non-function values", () => {
expect(() => {
Function.prototype.bind.call("foo");
}).toThrowWithMessage(TypeError, "Not an object of type Function");
}).toThrowWithMessage(TypeError, "foo is not a function");
});
});