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utils-deep-set

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  • License MIT

Deep set a nested property.

Package Exports

  • utils-deep-set

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (utils-deep-set) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

Deep Set

NPM version Build Status Coverage Status Dependencies

Deep set a nested property.

Installation

$ npm install utils-deep-set

For use in the browser, use browserify.

Usage

var deepSet = require( 'utils-deep-set' );

deepSet( obj, path, value[, options] )

Deep set a nested property.

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

var bool = deepSet( obj, 'a.b.c', 'beep' );
/*
    { 'a': { 'b': { 'c': 'beep' } } }
*/

If the function is able to deep set a nested property, the function returns true; otherwise, the function returns false.

var bool = deepSet( obj, 'a.b.c', 'woot' );
// returns true

bool = deepSet( obj, 'a.beep.c', 'boop' );
// returns false

bool = deepSet( null, 'a.beep.c', 'boop' );
// returns false

bool = deepSet( 'bap', 'a.beep.c', 'boop' );
// returns false

For paths including arrays, specify the numeric index.

var arr = [
    { 'a': [ {'x': 5} ] },
    { 'a': [ {'x': 10} ] }
];

var bool = deepSet( arr, '1.a.0.x', 25 );
/*
    [
        { 'a': [ {'x': 5} ] },
        { 'a': [ {'x': 25} ] }
    ]
*/

The key path may be specified as either a delimited string or a key array.

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

var bool = deepSet( obj, ['a','b','c'], 'beep' );
/*
    { 'a': { 'b': { 'c': 'beep' } } }
*/

If value is a function, the argument is treated as a callback and should return a value to set.

function set( val ) {
    var ch = val;
    for ( var i = 0; i < 4; i++ ) {
        val += ch;
    }
    return val;
}
var obj = { 'a': { 'b': { 'c': 'd' } } };

var bool = deepSet( obj, 'a.b.c', set );
/*
    { 'a': { 'b': { 'c': 'ddddd' } } }
*/

The function accepts the following options:

  • sep: key path separator. Default: '.'.
  • create: boolean indicating whether to create a path if the key path does not already exist. Default: false.

By default, the function assumes dot separated key values. To specify an alternative separator, set the sep option.

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

var bool = deepSet( obj, 'a/b/c', 'beep', {
    'sep': '/'	
});
/*
    { 'a': { 'b': { 'c': 'beep' } } }
*/

To create a key path which does not already exist, set the create option to true.

var bool = deepSet( obj, 'a.e.c', 'boop', {
    'create': true	
});
/*
    { 
        'a': { 
            'b': {
                'c': 'beep'
            }, 
            'e': {
                'c': 'boop'
            } 
        }
    }
*/

deepSet.factory( path[, options] )

Creates a reusable deep set factory. The factory method ensures a deepSet function is configured identically by using the same set of provided options.

var dset = deepSet.factory( 'a/b/c', {
    'create': true,
    'sep': '/'
});

dset( obj, value )

Deep sets a nested property.

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

var bool = dset( obj, 'beep' );
/*
    { 'a': { 'b': { 'c': 'beep' } } }
*/

Examples

var deepSet = require( 'utils-deep-set' );

var data,
    bool,
    keys,
    i;

function set( val ) {
    return val * 10;
}

data = new Array( 100 );
for ( i = 0; i < data.length; i++ ) {
    data[ i ] = {
        'x': Date.now(),
        'y': [ Math.random(), Math.random(), i ]
    };
}

keys = [ 0, 'y', 2 ];
for ( i = 0; i < data.length; i++ ) {
    keys[ 0 ] = i;
    bool = deepSet( data, keys, set );
    if ( !bool ) {
        console.error( 'Unable to deep set value.' );
    }
}
console.log( data );

To run the example code from the top-level application directory,

$ node ./examples/index.js

Tests

Unit

Unit tests use the Mocha test framework with Chai assertions. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

License

MIT license.

Copyright © 2015. Athan Reines.