Javascript Function-Pointer Assignment

Question

Consider this javascript code:

var bar = function () { alert(\"A\"); }
var foo = bar;
bar = function () { alert(\"B\"); };
foo();

When runn

Answer 1

For each FunctionDeclaration f in code, in source text order do:

Let fn be the Identifier in FunctionDeclaration f.

Let fo be the result of instantiating FunctionDeclaration f as described in Clause 13.

Let funcAlreadyDeclared be the result of calling env’s HasBinding concrete method passing fn as the argument.

If funcAlreadyDeclared is false, call env’s CreateMutableBinding concrete method passing fn and configurableBindings as the arguments.

References

• ECMAScript-5: Section 10.5