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98 lines
2.1 KiB
98 lines
2.1 KiB
/*
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* Various identifier shadowing cases
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*/
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/*===
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function
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undefined
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function
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inner foo
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number
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===*/
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/* Function expression name is bound outside the function scope;
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* a single-identifier scope is created between the surrounding
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* scope and the function scope.
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*
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* Thus you can declare a variable or a function of the same name,
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* and it will hide the function name binding.
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*/
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try {
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/* Base case */
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eval("(function foo() { print(typeof foo); })();");
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} catch (e) {
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print(e.name);
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}
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try {
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/* Var declaration shadows and is undefined, since variable
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* declaration happens on entry but assignment only when
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* statement is reached.
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*/
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eval("(function foo() { print(typeof foo); var foo = 1; })();");
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} catch (e) {
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print(e.name);
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}
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try {
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/* Function declaration shadows and is defined as the inner
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* function: function declarations happen on entry.
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*/
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eval("(function foo() { print(typeof foo); foo(); function foo() { print('inner foo'); }; })();");
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} catch (e) {
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print(e.name);
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}
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try {
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/* Argument shadows the function name binding, again simply
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* because the function name binding exists "outside" the
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* function scope.
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*/
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eval("(function foo(foo) { print(typeof foo); })(1);");
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} catch (e) {
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print(e.name);
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}
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/*===
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123
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function
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inner func
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1
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1
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10
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===*/
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/* An argument name shadows automatic 'arguments' binding */
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try {
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eval("(function foo(arguments) { print(arguments); })(123);");
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} catch (e) {
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print(e.name);
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}
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/* A function declaration inside the function shadows automatic 'arguments'
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* binding.
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*/
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try {
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eval("(function foo() { function arguments() { print('inner func'); }; print(typeof arguments); arguments(); })();");
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} catch (e) {
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print(e.name);
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}
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/* A variable declaration does NOT shadow the automatic 'arguments' binding. */
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try {
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eval("(function foo() { var arguments; print(arguments[0]); })(1,2)");
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} catch (e) {
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print(e.name);
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}
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try {
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eval("(function foo() { print(arguments[0]); var arguments = 10; print(arguments); })(1,2)");
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} catch (e) {
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print(e.name);
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}
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