27c39c512d
* Update member-expression-to-functions 1. Babel using British spellings, so `memoise` 2. Provide a helper `AssignmentMemoiser` class, which will assign the memo'd value with the `n`th access. * Private properties! * Fixes * Tests * Update helper name * Fix privates that reference other privates * Don't extend a builtin * Rebase
74 lines
1.6 KiB
JavaScript
74 lines
1.6 KiB
JavaScript
class Point {
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#x;
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#y;
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constructor(x = 0, y = 0) {
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this.#x = +x;
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this.#y = +y;
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}
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get x() { return this.#x }
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set x(value) { this.#x = +value }
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get y() { return this.#y }
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set y(value) { this.#y = +value }
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equals(p) { return this.#x === p.#x && this.#y === p.#y }
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toString() { return `Point<${ this.#x },${ this.#y }>` }
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}
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const p1 = new Point(1, 2);
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const p2 = new Point(2, 3);
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const p3 = new Point(1, 2);
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expect(p1.x).toBe(1);
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expect(p1.y).toBe(2);
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expect(p2.x).toBe(2);
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expect(p2.y).toBe(3);
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expect(p3.x).toBe(1);
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expect(p3.y).toBe(2);
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expect(p1.equals(p1)).toBe(true)
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expect(p1.equals(p2)).toBe(false)
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expect(p1.equals(p3)).toBe(true)
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expect(p2.equals(p1)).toBe(false)
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expect(p2.equals(p2)).toBe(true)
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expect(p2.equals(p3)).toBe(false)
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expect(p3.equals(p1)).toBe(true)
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expect(p3.equals(p2)).toBe(false)
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expect(p3.equals(p3)).toBe(true)
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expect(p1.toString()).toBe("Point<1,2>")
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expect(p2.toString()).toBe("Point<2,3>")
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expect(p3.toString()).toBe("Point<1,2>")
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p1.x += 1;
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p1.y = 3;
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p2.x -= 1;
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p2.y = 3;
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p3.x = 0;
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p3.y = 0;
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expect(p1.x).toBe(2);
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expect(p1.y).toBe(3);
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expect(p2.x).toBe(1);
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expect(p2.y).toBe(3);
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expect(p3.x).toBe(0);
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expect(p3.y).toBe(0);
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expect(p1.equals(p1)).toBe(true)
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expect(p1.equals(p2)).toBe(false)
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expect(p1.equals(p3)).toBe(false)
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expect(p2.equals(p1)).toBe(false)
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expect(p2.equals(p2)).toBe(true)
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expect(p2.equals(p3)).toBe(false)
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expect(p3.equals(p1)).toBe(false)
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expect(p3.equals(p2)).toBe(false)
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expect(p3.equals(p3)).toBe(true)
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expect(p1.toString()).toBe("Point<2,3>")
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expect(p2.toString()).toBe("Point<1,3>")
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expect(p3.toString()).toBe("Point<0,0>")
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