When using ES2015, my goal is to enhance the Function class and utilize its instance as a callable function.
class Foo extends Function {
// What is the best way to implement behavior here?
}
let foo = new Foo();
foo();
foo.call();
// The object is callable, but no specific behavior has been defined
How can I assign unique functionality to foo when declaring it?
When using the Function constructor, you can pass arguments like this:
new Function ([arg1[, arg2[, ...argN]],] functionBody)
To use it, simply call super with the appropriate arguments:
// CODE WILL ONLY WORK IN ES2015-ENABLED ENVIRONMENTS
"use strict";
class Foo extends Function {
constructor() {
super("a", "console.log(a);")
}
}
let foo = new Foo();
foo("one");
foo.call(null, "two");Writing JavaScript code inside a string literal can be cumbersome, and since the function text is evaluated at global scope, defining the actual function within the constructor and calling it from the function text is not possible. This limits its usability. However...
If you haven't modified the constructor, you can use a string as an argument in the original function constructor like this:
const bar = new Bar("alert('Hello World!')");
bar(); // displays 'Hello World!'.
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