ExtendMerge

=============

Yet another extend function. Yes, I did think of crappier names, but they were all taken. This is the same as all the other extend functions you've ever seen, with a few differences:

• there is no extend(true,...: extends are always deep.
• arrays are concatenated by default
• you can 'extend' strings by using #{_}
• you can swap sub-functions to modify how objects are treated. For example, changing the extend.arrays function will modify how arrays are treated; so you can, for example, keep most of the functionality, but add in your own custom array merging logic.

Usage

npm install --save extendmerge

var extend = require('extendmerge');
var obj = extend({},{prop:'val'},{prop:'will overwrite val'});

Extending functions

The functions below are meant to be modified by the user in order to customize behaviour:

• extend.objects(o1,o2): merges two objects. You are guaranteed that o1 is an object, but o2 can be anything.
• extend.arrays(o1,o2): merges two arrays. You are guaranteed that o1 is an array, but o2 can be anything
• extend.strings(o1,o2): merges two strings. You are guaranteed that o1 is a string, but o2 can be anything
• extend.numbers(o1,o2): merges two numbers. You are guaranteed that o1 is a number, but o2 can be anything.

Additionally, you can also change the regexes used for string extension:

• extend.regex: is used for string extension (see below)
• extend.populateRegex: is used when populating an object (see below)

You also have access to the convenience library dis, available as extend.is.

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Convenience Functions

extend.walk(Object:obj,Function:fn)

runs the function for every node of the object. Begins deep and goes back to the root. The function has a signature of function(property,type,NOCHANGE){return NOCHANGE} where property is the value, type is the property type (string, array...), and NOCHANGE is a constant that you must return if you don't want to change the object.

get([String|Array]:path,Object:obj[,String:delimiter])

Gets a property of the provided object obj by path. Path delimiter defaults to '.', but you can set it to something else if you'd like. You can also pass an array, in which case the delimiter is not used.
You can also use '*' and '**' to be more vague in the path resolution.
so for the object:

    var obj = {
        a:{
            b:{
                c:{
                    d:'text'
                }
            }
        }
    }

    //valid paths:
    extend.get('a.b.c.d',obj);
    extend.get('*.*.*.d',obj);
    extend.get('**.d',obj)

If there is more than one d key, you would get the first one found.

populate(obj)

will replace all text instances like so #{a.b.c.d} with the closest value that can be found; Globbing works here too.

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Testing

Do check out the tests, they explain much better than this document can.

npm install mocha chai

then, run mocha in the main dir.

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License

MIT