111 lines
3.0 KiB
Markdown
111 lines
3.0 KiB
Markdown
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object-path
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===========
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Access deep properties using a path
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[](http://badge.fury.io/js/object-path)
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[](https://travis-ci.org/mariocasciaro/object-path)
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[](https://coveralls.io/r/mariocasciaro/object-path)
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[](https://david-dm.org/mariocasciaro/object-path#info=devDependencies)
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## Install
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### Node.js
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```
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npm install object-path
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```
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### Browser
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```
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bower install object-path
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```
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### Typescript typings
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```
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tsd query object-path --action install --save
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```
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## Usage
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```javascript
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var obj = {
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a: {
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b: "d",
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c: ["e", "f"]
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}
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};
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var objectPath = require("object-path");
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//get deep property
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objectPath.get(obj, "a.b"); //returns "d"
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//get the first non-undefined value
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objectPath.coalesce(obj, ['a.z', 'a.d', ['a','b']], 'default');
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//empty a given path (but do not delete it) depending on their type,so it retains reference to objects and arrays.
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//functions that are not inherited from prototype are set to null.
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//object instances are considered objects and just own property names are deleted
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objectPath.empty(obj, 'a.b'); // obj.a.b is now ''
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objectPath.empty(obj, 'a.c'); // obj.a.c is now []
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objectPath.empty(obj, 'a'); // obj.a is now {}
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//works also with arrays
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objectPath.get(obj, "a.c.1"); //returns "f"
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objectPath.get(obj, ["a","c","1"]); //returns "f"
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//can return a default value with get
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objectPath.get(obj, ["a.c.b"], "DEFAULT"); //returns "DEFAULT", since a.c.b path doesn't exists, if omitted, returns undefined
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//set
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objectPath.set(obj, "a.h", "m"); // or objectPath.set(obj, ["a","h"], "m");
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objectPath.get(obj, "a.h"); //returns "m"
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//set will create intermediate object/arrays
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objectPath.set(obj, "a.j.0.f", "m");
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//will insert values in array
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objectPath.insert(obj, "a.c", "m", 1); // obj.a.c = ["e", "m", "f"]
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//push into arrays (and create intermediate objects/arrays)
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objectPath.push(obj, "a.k", "o");
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//ensure a path exists (if it doesn't, set the default value you provide)
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objectPath.ensureExists(obj, "a.k.1", "DEFAULT");
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//deletes a path
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objectPath.del(obj, "a.b"); // obj.a.b is now undefined
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objectPath.del(obj, ["a","c",0]); // obj.a.c is now ['f']
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//tests path existence
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objectPath.has(obj, "a.b"); // true
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objectPath.has(obj, ["a","d"]); // false
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//bind object
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var model = objectPath({
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a: {
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b: "d",
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c: ["e", "f"]
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}
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});
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//now any method from above is supported directly w/o passing an object
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model.get("a.b"); //returns "d"
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model.get(["a.c.b"], "DEFAULT"); //returns "DEFAULT"
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model.del("a.b"); // obj.a.b is now undefined
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model.has("a.b"); // false
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```
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### Credits
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* [Mario Casciaro](https://github.com/mariocasciaro) - Author
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* [Paulo Cesar](https://github.com/pocesar) - Major contributor
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