underscore.nested

Nested and delegating object-graph extensions for Underscore.js.

Usage

For usage in node.js, install it via npm: npm install underscore.nested.

Once Then mix it into Underscore:

var _ = require('underscore');
_.mixin require('underscore.nested');

API

Options

Many accessor functions take an options object with common fields. The sub-object delegation options (getter, setter, and deleter) are used to specify where to look for the specific accessor method on a custom sub-object when performing that operation. (Functions that do not use that operation will ignore these options, so you're welcome to specify them everywhere just to be safe.)

<tbody>
    <tr>
        <td>
            <strong>ensure</strong>
        </td>
        <td>
            <code>Boolean</code>
        </td>
        <td>
            <code>false</code>
        </td>
        <td>
            If true, intermediate keys that are <code>null</code> or <code>undefined</code> will be filled in with a new empty object <code>{}</code>, ensuring the get will return valid metadata.
        </td>
    </tr>

    <tr>
        <td>
            <strong>getter</strong>
        </td>
        <td>
            <code>String</code>
        </td>
        <td>
            <code>"get"</code>
        </td>
        <td>
            Name of the sub-object getter method use if it exists.
        </td>
    </tr>

    <tr>
        <td>
            <strong>setter</strong>
        </td>
        <td>
            <code>String</code>
        </td>
        <td>
            <code>"set"</code>
        </td>
        <td>
            Name of the sub-object setter method use if it exists.
        </td>
    </tr>

    <tr>
        <td>
            <strong>deleter</strong>
        </td>
        <td>
            <code>String</code>
        </td>
        <td>
            <code>"unset"</code>
        </td>
        <td>
            Name of the sub-object deleter method use if it exists.
        </td>
    </tr>
</tbody>

Delegating Accessors

_.get(target, key, def, opts) -> value

Gets the value at key from the object if present, returning def otherwise.

_.set(target, key, value, opts) -> target

Puts a given value to key on the given target object. If an object is supplied as key instead of a String, each key-value pair on that object will be put to the target object. In this case, omit value. Returns the target object.

_.unset(target, key, opts) -> oldValue

Deletes key from the target object, returning whatever value was present prior to being removed.

_.isMember(object, ...values) -> Boolean

Tests whether all values are contained in the given collection (accepting Object or Array).

Nested Delegating Accessors

These methods perform nested accessor operations, delegating like their non-nested counterparts to the target object when an instance method is found matching the operation.

_.getNested(target, chain, def, opts) -> value

Searches a hierarchical object for a given subkey specified in dotted-property syntax, returning the value if found, and def otherwise.

_.setNested(target, chain, value, opts) -> oldValue

Searches a hierarchical object for a given subkey specified in dotted-property syntax, setting it with the provided value if found.

_.unsetNested(target, chain, opts) -> target

Searches a hierarchical object for a potentially-nested key and removes it, returning whatever value was present there prior to being removed.

_.getNestedMeta(object, chain, opts) -> Object

[Private] Searches a hierarchical object for a given subkey (specified in dotted-property syntax), respecting sub-object accessor-methods (e.g., 'get', 'set') if they exist. If found, returns an object of the form { key: Qualified key name, obj: Parent object of key, val: Value at obj[key], opts: Options }, and otherwise undefined.

Collection Utilities

_.merge(target={}, ...donors) -> target

Recursively merges together any number of donor objects into the target object. (Modified from jQuery.extend().)

_.isPlainObject(object) -> Boolean

Returns whether value is a plain object or not.

_.remove(object, value) -> Object

In-place removal of a value from an Array or Object. Returns the object.

_.items(object) -> Array

Converts the collection to a list of its items:

• Objects become a list of [key, value] pairs.
• Strings become a list of characters.
• Arguments objects become an array.
• Arrays are copied.

Feedback

Find a bug or want to contribute? Open a ticket (or fork the source!) on github. You're also welcome to send me email at [email protected].

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underscore.nested was written by David Schoonover; it is open-source software and freely available under the MIT License.