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LibJS: Implement Array.prototype.groupByToMap
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97 changes: 97 additions & 0 deletions
97
Userland/Libraries/LibJS/Tests/builtins/Array/Array.prototype.groupByToMap.js
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test("length is 1", () => { | ||
expect(Array.prototype.groupByToMap).toHaveLength(1); | ||
}); | ||
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describe("errors", () => { | ||
test("callback must be a function", () => { | ||
expect(() => { | ||
[].groupByToMap(undefined); | ||
}).toThrowWithMessage(TypeError, "undefined is not a function"); | ||
}); | ||
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test("null or undefined this value", () => { | ||
expect(() => { | ||
Array.prototype.groupByToMap.call(); | ||
}).toThrowWithMessage(TypeError, "ToObject on null or undefined"); | ||
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expect(() => { | ||
Array.prototype.groupByToMap.call(undefined); | ||
}).toThrowWithMessage(TypeError, "ToObject on null or undefined"); | ||
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expect(() => { | ||
Array.prototype.groupByToMap.call(null); | ||
}).toThrowWithMessage(TypeError, "ToObject on null or undefined"); | ||
}); | ||
}); | ||
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describe("normal behavior", () => { | ||
test("basic functionality", () => { | ||
const array = [1, 2, 3, 4, 5, 6]; | ||
const visited = []; | ||
const trueObject = { true: true }; | ||
const falseObject = { false: false }; | ||
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const firstResult = array.groupByToMap(value => { | ||
visited.push(value); | ||
return value % 2 === 0 ? trueObject : falseObject; | ||
}); | ||
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expect(visited).toEqual([1, 2, 3, 4, 5, 6]); | ||
expect(firstResult).toBeInstanceOf(Map); | ||
expect(firstResult.size).toBe(2); | ||
expect(firstResult.get(trueObject)).toEqual([2, 4, 6]); | ||
expect(firstResult.get(falseObject)).toEqual([1, 3, 5]); | ||
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const secondResult = array.groupByToMap((_, index) => { | ||
return index < array.length / 2 ? trueObject : falseObject; | ||
}); | ||
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expect(secondResult).toBeInstanceOf(Map); | ||
expect(secondResult.size).toBe(2); | ||
expect(secondResult.get(trueObject)).toEqual([1, 2, 3]); | ||
expect(secondResult.get(falseObject)).toEqual([4, 5, 6]); | ||
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const thisArg = [7, 8, 9, 10, 11, 12]; | ||
const thirdResult = array.groupByToMap(function (_, __, arrayVisited) { | ||
expect(arrayVisited).toBe(array); | ||
expect(this).toBe(thisArg); | ||
}, thisArg); | ||
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expect(thirdResult).toBeInstanceOf(Map); | ||
expect(thirdResult.size).toBe(1); | ||
expect(thirdResult.get(undefined)).not.toBe(array); | ||
expect(thirdResult.get(undefined)).not.toBe(thisArg); | ||
expect(thirdResult.get(undefined)).toEqual(array); | ||
}); | ||
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test("never calls callback with empty array", () => { | ||
var callbackCalled = 0; | ||
const result = [].groupByToMap(() => { | ||
callbackCalled++; | ||
}); | ||
expect(result).toBeInstanceOf(Map); | ||
expect(result.size).toBe(0); | ||
expect(callbackCalled).toBe(0); | ||
}); | ||
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test("calls callback once for every item", () => { | ||
var callbackCalled = 0; | ||
const result = [1, 2, 3].groupByToMap(() => { | ||
callbackCalled++; | ||
}); | ||
expect(result).toBeInstanceOf(Map); | ||
expect(result.size).toBe(1); | ||
expect(result.get(undefined)).toEqual([1, 2, 3]); | ||
expect(callbackCalled).toBe(3); | ||
}); | ||
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test("still returns a Map even if the global Map constructor was changed", () => { | ||
globalThis.Map = null; | ||
const result = [1, 2].groupByToMap(value => { | ||
return value % 2 === 0; | ||
}); | ||
expect(result.size).toBe(2); | ||
expect(result.get(true)).toEqual([2]); | ||
expect(result.get(false)).toEqual([1]); | ||
}); | ||
}); |