99f9609e45
In the spec, this happens in the EvaluateCall abstract operation (https://tc39.es/ecma262/#sec-evaluatecall), and the order is defined as: 3. Let argList be ? ArgumentListEvaluation of arguments. 4. If Type(func) is not Object, throw a TypeError exception. 5. If IsCallable(func) is false, throw a TypeError exception. In LibJS this is handled by CallExpression::execute(), which had the callee function check first and would therefore never evaluate the arguments for a non-function callee.
30 lines
809 B
JavaScript
30 lines
809 B
JavaScript
test("callee is evaluated before arguments", () => {
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function foo() {}
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const values = [];
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[foo][(values.push("callee"), 0)](values.push("args"));
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expect(values).toEqual(["callee", "args"]);
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});
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test("arguments are evaluated in order", () => {
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function foo() {}
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const values = [];
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foo(values.push("arg1"), values.push("arg2"), values.push("arg3"));
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expect(values).toEqual(["arg1", "arg2", "arg3"]);
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});
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test("arguments are evaluated before callee is checked for its type", () => {
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const values = [];
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expect(() => {
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"foo"(values.push("args"));
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}).toThrowWithMessage(TypeError, "foo is not a function");
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expect(values).toEqual(["args"]);
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expect(() => {
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"foo"(bar);
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}).toThrowWithMessage(ReferenceError, "'bar' is not defined");
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});
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