Whether or not you start Venkman first or the browser component, when the Mozilla suite starts up, the JavaScript engine begins to keep track of and compile all the scripts that are loaded in web pages and in the various Mozilla user interfaces themselves.
A Typed Array is a slab of memory with a typed view into it, much like how arrays work in C. Because a Typed Array is backed by raw memory, the JavaScript engine can pass the memory directly to native libraries without having to painstakingly convert the data to a native representation.
It correctly finds our variable instantiated with our first statement After finding it, the expression is evaluated, foo is replaced by 5 and the JavaScript engine passes that value to the functions as an argument Before executing the statements inside the functions' bodies, JavaScript takes a copy of the original passed argument(which is a primitive) and creates a local copy.
And while recent JavaScript engines may apply optimization in this case, there is no way of telling whether the code will run on one of these newer engines or not.
Environment-version: The version of the JavaScript engine on which the server code is executed(For more information about the JavaScript engine, see JavaScript Engine)..
Note: Because the JavaScript shell is used as a test environment for the JavaScript engine, the available options and built-in functions can change over time.
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