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59 lines
972 B
59 lines
972 B
/*
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* With statement (E5 Section 12.10).
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*/
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var obj;
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/*===
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undefined
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10
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===*/
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/* Since 'with' does not alter the variable environment (which is
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* used for variable declarations), any declarations should go to
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* the function level instead.
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*/
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obj = { x: 100 };
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function f_decl1() {
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with (obj) {
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eval("var foo = 10;"); /* created in function */
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}
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print(obj.foo); // -> undefined
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print(foo); // 10
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}
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try {
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f_decl1();
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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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100
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undefined
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===*/
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/* Since 'with' delete operations walk through the lexical environment
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* (same as variable lookup) and not the variable environment (for
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* declarations), deleting properties of the bound object should be
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* possible.
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*/
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obj = { x: 100 };
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function f_del1() {
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var x = 200; /* should not affect anything */
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print(obj.x);
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with (obj) {
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delete x;
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}
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print(obj.x);
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}
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try {
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f_del1();
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} catch (e) {
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print(e.name);
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}
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