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LibJS: Implement Array.prototype.copyWithin generically
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5 changed files with 161 additions and 0 deletions
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@ -130,6 +130,35 @@ describe("ability to work with generic non-array objects", () => {
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}
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});
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test("copyWithin", () => {
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const initial_o = { length: 5, 0: "foo", 1: "bar", 3: "baz" };
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{
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const o = { length: 5, 0: "foo", 1: "bar", 3: "baz" };
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// returns value and modifies
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expect(Array.prototype.copyWithin.call(o, 0, 0)).toEqual(o);
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expect(o).toEqual(initial_o);
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}
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{
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const o = {};
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expect(Array.prototype.copyWithin.call(o, 1, 16, 32)).toEqual(o);
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expect(o).toEqual({});
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}
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{
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const o = { length: 100 };
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expect(Array.prototype.copyWithin.call(o, 1, 16, 32)).toEqual(o);
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expect(o).toEqual({ length: 100 });
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}
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{
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const o = { length: 5, 0: "foo", 1: "bar", 3: "baz" };
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// returns value and modifies
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expect(Array.prototype.copyWithin.call(o, 2, 0)).toEqual(o);
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expect(o).toEqual({ length: 5, 0: "foo", 1: "bar", 2: "foo", 3: "bar" });
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}
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});
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const o = { length: 5, 0: "foo", 1: "bar", 3: "baz" };
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test("every", () => {
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@ -0,0 +1,45 @@
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test("length is 2", () => {
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expect(Array.prototype.copyWithin).toHaveLength(2);
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});
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describe("normal behavior", () => {
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test("Noop", () => {
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var array = [1, 2];
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array.copyWithin(0, 0);
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expect(array).toEqual([1, 2]);
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});
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test("basic behavior", () => {
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var array = [1, 2, 3];
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var b = array.copyWithin(1, 2);
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expect(b).toEqual(array);
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expect(array).toEqual([1, 3, 3]);
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b = array.copyWithin(2, 0);
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expect(b).toEqual(array);
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expect(array).toEqual([1, 3, 1]);
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});
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test("start > target", () => {
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var array = [1, 2, 3];
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var b = array.copyWithin(0, 1);
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expect(b).toEqual(array);
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expect(array).toEqual([2, 3, 3]);
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});
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test("overwriting behavior", () => {
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var array = [1, 2, 3];
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var b = array.copyWithin(1, 0);
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expect(b).toEqual(array);
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expect(array).toEqual([1, 1, 2]);
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});
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test("specify end", () => {
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var array = [1, 2, 3];
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b = array.copyWithin(2, 0, 1);
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expect(b).toEqual(array);
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expect(array).toEqual([1, 2, 1]);
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});
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});
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