Execute the function to make this unnecessary

Question

Execute the function to make this unnecessary

I am facing an issue with my application that utilizes the v8 javascript engine. I have functions added to namespace objects which execute lines of code from the database. The challenge is to make sure that these functions do not require 'this' to be added before every function call. Below is an example showcasing my problem:

var obj = {};
obj.method = function(a) { return a; }
obj.executor = function() { return method(5); }
obj.executor()
ReferenceError: method is not defined

var caller = function() { return method(5); }
caller.call(obj)
ReferenceError: method is not defined

As seen above, neither method enables me to call 'method' without adding 'this' before it. Is there any way to execute a function in such a manner that 'this' does not need to be appended?

EDIT

This approach worked in a previous version of the v8 engine, but it appears to be unsupported in the latest version.

javascript function

Answer 1

Answer №1

"The rules set by the client involve loading strings from the database, with a strange requirement that only function names are needed and the application takes care of scoping."

If you're not using strict mode, one option is to use a with statement.

var obj = {};
obj.method = function(a) { return a; };
obj.executor = function() { 
    with (this) {
        return method(5);
    }
};
obj.executor();

var caller = function() { 
    with (this) {
        return method(5); 
    }
};

caller.call(obj);

This may not be the best solution, but it meets the given requirements.

Although I don't know all your requirements, achieving this through a closure is another possibility.

var obj = {};

(function() {
    var method = obj.method = function(a) { return a; };
    obj.executor = function() { 
        return method(5);
    };
}();

obj.executor();

Answer 2

"The rules set by the client involve loading strings from the database, with a strange requirement that only function names are needed and the application takes care of scoping."

If you're not using strict mode, one option is to use a with statement.

var obj = {};
obj.method = function(a) { return a; };
obj.executor = function() { 
    with (this) {
        return method(5);
    }
};
obj.executor();

var caller = function() { 
    with (this) {
        return method(5); 
    }
};

caller.call(obj);

This may not be the best solution, but it meets the given requirements.

Although I don't know all your requirements, achieving this through a closure is another possibility.

var obj = {};

(function() {
    var method = obj.method = function(a) { return a; };
    obj.executor = function() { 
        return method(5);
    };
}();

obj.executor();

Execute the function to make this unnecessary

Answer №1

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