util-mix

Object mixing methods

Usage

var mix = require('util-mix');
var Mixer = require('util-mix/Mixer');

var o = mix({ a: 1 }, { b: 2 }); // { a: 1, b: 2 }

var mixer = Mixer({ a: 0, b: 0 });
o = mixer.mix({}); // { a: 0, b: 0 }
o = mixer.mix({ c: 1 }); // { a: 0, b: 0, c: 1 }

mix(receiver, src1, src2,...)

Mix own properties supplied by src1, src2,..., into receiver, which must be a non-null object.

Same key causes overwriting, the later appearance in arguments the winner.

The receiver will be returned.

var r = {};
var o = mix(r, { x:1, y:1 }, { y:2 });

o === r; // true
o; // { x:1, y:2 }

mix-undef(receiver, src1, src2,...)

Same with mix, except that properties are only mixed when not defined in receiver.

var mix = require('util-mix/mix-undef');
var o = { x: 1 };
mix(o, { x: 2 }, { y: 2 }, { z: 3 }, { x: 3 });

o; // { x: 1, y: 2, z: 3 }

merge(src1, src2,...)

Same as mix({}, src1, src2,...).

var r = {};
var o = merge(r, { x:1, y:1 }, { y:2 });

r; // {}
o; // { x:1, y:2 }

copy(src)

Same as merge.

pick(filter, src1, src2,...)

filter

Type: String, Array

Same as merge(src1, src2,...), but only keys specified in filter appear in the result.

var o = pick(['x', 'y'], { x:1, y:1 }, { y:2 }, { z:3 });

o; // { x:1, y:2 }

unpick(filter, src1, src2,...)

filter

Type: String, Array

Merge all properties from src1, src2,... except those appear in filter

var o = unpick(['x', 'y'], { x:1, y:1 }, { y:2 }, { z:3 });

o; // { z:3 }

chop(filter, o)

filter

Type: String, Array

pick keys specified by filter from o, and delete them from o.

var o = { x:1, y:2, z:3 };
var chopped = chop(['x', 'y'], o);

chopped; // { x:1, y:2 }
o; // { z:3 }

Class: Mixer

methods

mix(receiver, src1, src2,...)

merge(src1, src2,...)

mixer = Mixer(filter, defaults)

filter

Type: Array

Only mix keys contained in filter.

defaults

Type: Object

Always mix defaults, and it will always be overwritten.

var mixer = Mixer(['x', 'y'], { x:1 });
var opts = {};
var o = mixer.mix(opts, { y:2, z:3 });

o === opts; // true
o; // { x:1, y:2 }

mixer = Mixer(o)

o

Type: Object

Same as Mixer(Object.keys(o), o)

var mixer = Mixer({ x:1, y:1 });
var o = mixer.merge({ y:2 }, { z:3 });

o === opts; // true
o; // { x:1, y:2 }