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LibJS: Unify exponentiation logic for ** operator and Math.pow
The JS behaviour of exponentiation on two number typed values is not a simple matter of forwarding to ::pow(double, double). So, this factors out the Math.pow logic to allow it to be shared with Value::exp.
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3 changed files with 70 additions and 48 deletions
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@ -35,3 +35,18 @@ test("exponentiation that produces NaN", () => {
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expect(2 ** "foo").toBeNaN();
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expect("foo" ** 2).toBeNaN();
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});
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test("exponentiation with infinities", () => {
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expect((-1) ** Infinity).toBeNaN();
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expect(0 ** Infinity).toBe(0);
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expect(1 ** Infinity).toBeNaN();
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expect((-1) ** -Infinity).toBeNaN();
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expect(0 ** -Infinity).toBe(Infinity);
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expect(1 ** -Infinity).toBeNaN();
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expect(Infinity ** -1).toBe(0);
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expect(Infinity ** 0).toBe(1);
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expect(Infinity ** 1).toBe(Infinity);
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expect((-Infinity) ** -1).toBe(-0);
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expect((-Infinity) ** 0).toBe(1);
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expect((-Infinity) ** 1).toBe(-Infinity);
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});
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