javascript - How to get context of calling functionobject? - Stack Overflow

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function define(prop, value) {
    Object.defineProperty( /* context of caller */ , prop, {value: value});
}

function F() {
    define('x', 42);
}

var f = new F();

Is there a way to get context (inline mented in code above) of the calling function?

It works fine if I bind to this (replace ment to this) and inside F constructor declare var def = define.bind(this);

function define(prop, value) {
    Object.defineProperty( /* context of caller */ , prop, {value: value});
}

function F() {
    define('x', 42);
}

var f = new F();

Is there a way to get context (inline mented in code above) of the calling function?

It works fine if I bind to this (replace ment to this) and inside F constructor declare var def = define.bind(this);

• javascript
• this
• function-constructor

Share Improve this question Follow edited Jun 16, 2015 at 8:40 Brian Tompsett - 汤莱恩 5,8937272 gold badges6161 silver badges133133 bronze badges asked Jun 30, 2013 at 17:35 jsguffjsguff 10511 silver badge55 bronze badges 5

• 1 stackoverflow./questions/9679053/…, looks like you have to pass this to define – Patrick Evans Commented Jun 30, 2013 at 17:38
• Yeah, question is there a way to do it without passing this – jsguff Commented Jun 30, 2013 at 17:44
• define.call(this, 'x', 42);? Then Object.defineProperty(this, ...) – user2437417 Commented Jun 30, 2013 at 17:45
• ...or just put your define function on F.prototype like F.prototype.define = define, so you can do this.define(...) in the constructor, and this in define will automatically be your object. – user2437417 Commented Jun 30, 2013 at 17:50
• @CrazyTrain, putting define in F.prototype and this.define(...) looks better than binding, but that isn't mon case. – jsguff Commented Jun 30, 2013 at 18:09

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1 Answer 1

Sorted by: Reset to default 5

How to get context of calling function/object?

You can't, you'll have to make it available to your define function explicitly (pass it in as an argument, etc.).

And this is a Good Thing^(tm). :-) The last thing you'd want is functions having access to the caller's context and changing things in an uncontrolled way.

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