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Code Block

title	load function

// can load script from files, URLs

load("foo.js"); // loads script from file "foo.js" from current directory
load("http://www.example.com/t.js"); // loads script file from given URL

// loads script from an object's properties. 

// Object should have "script" and "name" properties.
//     "script" property contains string code of the script. 
//     "name" property specifies name to be used while reporting errors from script
// This is almost like the standard "eval" except that it associates a name with
// the script string for debugging purpose.

load({ script: "print('hello')", name: "myscript.js"})

// load can also load from pseudo URLs like "nashorn:", "fx:". "nashorn:" pseudo URL scheme
// for nashorn's built-in scripts. "fx:" pseudo URL scheme for JavaFX support scripts

// load nashorn's parser support script - defines 'parse'
// function in global scope

load("nashorn:parser.js"); 

// load Mozilla compatibility script - which defines global functions
// like importPackage, importClass for rhino compatibility.

load("nashorn:mozilla_compat.js");

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loadWithNewGlobal function

loadWithNewGlobal is almost like the function "load" in that it loads script from a file or a URL or a script object. But unlike 'load', loadWithNewGlobal creates a fresh ECMAScript global scope object and loads the script into it. The loaded script's global definitions go into the fresh global scope. Also, the loaded script's modifications of builtin objects (like String.prototype.indexOf) is not reflected in the caller's global scope – these are affected in the newly created global scope.

Code Block

title	loadWithNewGlobal

loadWithNewGlobal({
    script: "foo = 333; print(foo)",
    name: "test"
});

// prints undefined as "foo" is defined in the new global and not here
print(typeof foo);

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