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LibJS: Get initial_value from local variables if id represents a local
If identifier represents local variable we should get its value from `local_variables` in `ExecutionContext` instead of environment.
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2 changed files with 14 additions and 1 deletions
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@ -661,7 +661,11 @@ ThrowCompletionOr<void> ECMAScriptFunctionObject::function_declaration_instantia
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// 4. Else,
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// 4. Else,
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else {
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else {
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// a. Let initialValue be ! env.GetBindingValue(n, false).
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// a. Let initialValue be ! env.GetBindingValue(n, false).
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initial_value = MUST(environment->get_binding_value(vm, id.string(), false));
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if (id.is_local()) {
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initial_value = callee_context.local_variables[id.local_variable_index()];
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} else {
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initial_value = MUST(environment->get_binding_value(vm, id.string(), false));
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}
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}
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}
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// 5. Perform ! varEnv.InitializeBinding(n, initialValue).
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// 5. Perform ! varEnv.InitializeBinding(n, initialValue).
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@ -151,3 +151,12 @@ test("use variable as default function parameter", () => {
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expect(func()).toBe(a);
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expect(func()).toBe(a);
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});
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});
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test("variable is initialized to the value of the parameter if one with the same name exists", () => {
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function func(a = 1) {
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var a;
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return a;
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}
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expect(func()).toBe(1);
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});
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