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20696300
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2013-12-20T04:30:16.093
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2013-12-20T04:30:16.093
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<blockquote> consider the following code snippet: <pre><code>function foo(){ var bar={prop:'prop'} var test_bar=bar; test_test_bar={p:'p'}; } </code></pre> corresponding declarative environment record will be contain bindings <code>bar-->{prop:'prop'}, test_bar-->{prop:'prop'}, test_test_bar-->{p:'p'}</code>. Is it true? </blockquote> Nearly. It does contain <code>foo</code>, <code>bar</code> and <code>test_bar</code> (with their values). The environment record is part of an lexical environment that has a pointer to its "outer lexical environment" that holds the record with the global variables like <code>test_test_bar</code>. <blockquote> And one question: Is it true that for all syntactic elements there exists only one environment record. </blockquote> No. Environment records don't have much to do with syntactic elements, they are created dynamically at runtime within the execution contexts. There might as well be multiple environment records alive for the same code element, say in a closure. What the spec said is: "environment records are used to define the effect of ECMAScript language syntactic elements". They represent the structures that are used to explain what should happen when a syntax element is executed. <blockquote> What does mean bound name in this method's purpose? Is it pair of <code>Identifier-->variable</code> such as <code>bar-->{prop:'prop'}</code> in my example above? </blockquote> Nah, it's only the <code>Identifier</code>. The pair of identifier and value is called binding. To assign a value to an identifier, you use the <code>SetMutableBinding(bound_name, value, strict_flag)</code> method.
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