describe("parsing", () => { test("single name", () => { expect(`var { a } = {};`).toEval(); expect(`const { a } = {};`).toEval(); expect(`let { a } = {};`).toEval(); }); test("single name with rest values", () => { expect(`var { a, ...rest } = {};`).toEval(); expect(`const { a, ...rest } = {};`).toEval(); expect(`let { a, ...rest } = {};`).toEval(); }); test("single aliased name", () => { expect(`var { a: b } = {};`).toEval(); expect(`const { a: b } = {};`).toEval(); expect(`let { a: b } = {};`).toEval(); }); test("single aliased name with rest values", () => { expect(`var { a: b, ...rest } = {};`).toEval(); expect(`const { a: b, ...rest } = {};`).toEval(); expect(`let { a: b, ...rest } = {};`).toEval(); }); test("array destructuring patterns", () => { expect(`var [ a ] = [];`).toEval(); expect(`const [ a ] = [];`).toEval(); expect(`let [ a ] = [];`).toEval(); }); test("destructuring assignment with rest assignments, array patterns", () => { expect(`var [ a, ...rest ] = [];`).toEval(); expect(`const [ a, ...rest ] = [];`).toEval(); expect(`let [ a, ...rest ] = [];`).toEval(); }); test("destructuring assignment with rest names, array patterns with recursive patterns", () => { expect(`var [ a, [ ...rest ] ] = [];`).toEval(); expect(`const [ a, [ ...rest ] ] = [];`).toEval(); expect(`let [ a, [ ...rest ] ] = [];`).toEval(); }); test("destructuring assignment with rest names, array patterns with recursive patterns 2", () => { expect(`var [ a, [ ...{length} ] ] = [];`).toEval(); expect(`const [ a, [ ...{length} ] ] = [];`).toEval(); expect(`let [ a, [ ...{length} ] ] = [];`).toEval(); }); }); describe("evaluating", () => { test("single name", () => { let o = { a: 1 }; { var { a } = o; expect(a).toBe(o.a); } { const { a } = o; expect(a).toBe(o.a); } { let { a } = o; expect(a).toBe(o.a); } }); test("single name with rest values", () => { let o = { a: 1, b: 2 }; { var { a, ...b } = o; expect(a).toBe(o.a); expect(b).toEqual({ b: 2 }); } { const { a, ...b } = o; expect(a).toBe(o.a); expect(b).toEqual({ b: 2 }); } { let { a, ...b } = o; expect(a).toBe(o.a); expect(b).toEqual({ b: 2 }); } }); test("single aliased name", () => { let o = { a: 1 }; { var { a: x } = o; expect(x).toBe(o.a); } { const { a: x } = o; expect(x).toBe(o.a); } { let { a: x } = o; expect(x).toBe(o.a); } }); test("single aliased name with rest values", () => { let o = { a: 1, b: 2 }; { var { a: x, ...b } = o; expect(x).toBe(o.a); expect(b).toEqual({ b: 2 }); } { const { a: x, ...b } = o; expect(x).toBe(o.a); expect(b).toEqual({ b: 2 }); } { let { a: x, ...b } = o; expect(x).toBe(o.a); expect(b).toEqual({ b: 2 }); } }); test("array patterns", () => { let o = [1, 2, 3, 4]; { var [a, b] = o; expect(a).toBe(o[0]); expect(b).toBe(o[1]); } { const [a, b] = o; expect(a).toBe(o[0]); expect(b).toBe(o[1]); } { let [a, b] = o; expect(a).toBe(o[0]); expect(b).toBe(o[1]); } }); test("destructuring assignment with rest names, array patterns", () => { let o = [1, 2, 3, 4]; { var [a, ...b] = o; expect(a).toBe(o[0]); expect(b).toEqual(o.slice(1)); } { const [a, ...b] = o; expect(a).toBe(o[0]); expect(b).toEqual(o.slice(1)); } { let [a, ...b] = o; expect(a).toBe(o[0]); expect(b).toEqual(o.slice(1)); } }); test("destructuring assignment with rest names, array patterns with recursive patterns", () => { let o = [1, [2, 3, 4]]; { var [a, [b, ...c]] = o; expect(a).toBe(o[0]); expect(b).toBe(o[1][0]); expect(c).toEqual(o[1].slice(1)); } { const [a, [b, ...c]] = o; expect(a).toBe(o[0]); expect(b).toBe(o[1][0]); expect(c).toEqual(o[1].slice(1)); } { let [a, [b, ...c]] = o; expect(a).toBe(o[0]); expect(b).toBe(o[1][0]); expect(c).toEqual(o[1].slice(1)); } }); test("destructuring assignment with rest names, array patterns with recursive patterns 2", () => { let o = [1, [2, 3, 4]]; { var [a, [...{ length }]] = o; expect(a).toBe(o[0]); expect(length).toBe(o[1].length); } { const [a, [...{ length }]] = o; expect(a).toBe(o[0]); expect(length).toBe(o[1].length); } { let [a, [...{ length }]] = o; expect(a).toBe(o[0]); expect(length).toBe(o[1].length); } }); test("patterns with default", () => { let o = { a: 1 }; let { x = "foo", a = "bar" } = o; expect(x).toBe("foo"); expect(a).toBe(o.a); }); });