mirror of
https://github.com/zebrajr/ladybird.git
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18c0739bbb
Previously, the given test would create an object with the test
property that pointed to itself.
This is because `temp = temp.test || {}` overwrote the `temp` local
register, and `temp.test = temp` used the new object instead of the
original one it fetched.
Allows https://www.yorkshiretea.co.uk/ to load, which was failing in
Gsap library initialization.
34 lines
719 B
JavaScript
34 lines
719 B
JavaScript
test("Assignment should always evaluate LHS first", () => {
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function go(a) {
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let i = 0;
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a[i] = a[++i];
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}
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let a = [1, 2, 3];
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go(a);
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expect(a).toEqual([2, 2, 3]);
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});
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test("Binary assignment should always evaluate LHS first", () => {
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function go(a) {
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let i = 0;
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a[i] |= a[++i];
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}
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let a = [1, 2];
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go(a);
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expect(a).toEqual([3, 2]);
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});
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test("Base object of lhs of assignment is copied to preserve evaluation order", () => {
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let topLevel = {};
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function go() {
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let temp = topLevel;
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temp.test = temp = temp.test || {};
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}
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go();
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expect(topLevel.test).not.toBeUndefined();
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expect(topLevel.test).toEqual({});
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});
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