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Flatten Object
Flatten an object.
Installation
npm install @stdlib/utils-flatten-objectUsage
var flattenObject = require( '@stdlib/utils-flatten-object' );flattenObject( obj[, options] )
Flattens an object.
var obj = {
'a': {
'b': {
'c': 'd'
}
}
};
var out = flattenObject( obj );
// returns { 'a.b.c': 'd' }The function accepts the following options:
- depth: maximum depth to flatten.
-
copy:
booleanindicating whether to deep copy property values. Default:false. -
delimiter: key path delimiter. Default:
'.'. -
flattenArrays:
booleanindicating whether to flattenarrays. Default:false.
To flatten to a specified depth, set the depth option.
var obj = {
'a': {
'b': {
'c': 'd'
}
}
};
var out = flattenObject( obj, {
'depth': 1
});
// returns { 'a.b': {'c': 'd'} }
var bool = ( obj.a.b === out['a.b'] );
// returns trueTo deep copy property values, set the copy option to true.
var obj = {
'a': {
'b': {
'c': 'd'
}
}
};
var out = flattenObject( obj, {
'depth': 1,
'copy': true
});
// returns { 'a.b': { 'c': 'd' } }
var bool = ( obj.a.b === out['a.b'] );
// returns falseTo specify a custom key path delimiter, set the delimiter option.
var obj = {
'a': {
'b': {
'c': 'd'
}
}
};
var out = flattenObject( obj, {
'delimiter': '-|-'
});
// returns { 'a-|-b-|-c': 'd' }By default, the function does not flatten arrays. To flatten arrays, set the flattenArrays option to true.
var obj = {
'a': {
'b': [ 1, 2, 3 ]
}
};
var out = flattenObject( obj, {
'flattenArrays': true
});
// returns { 'a.b.0': 1, 'a.b.1': 2, 'a.b.2': 3 }flattenObject.factory( options )
Returns a function to flatten an object.
var flatten = flattenObject.factory({
'delimiter': '|',
'flattenArrays': true
});
var obj = {
'a': {
'b': {
'c': 'd'
}
}
};
var out = flatten( obj );
// returns { 'a|b|c': 'd' }
obj = {
'a': {
'b': [ 1, 2, 3 ]
}
};
out = flatten( obj );
// returns { 'a|b|0': 1, 'a|b|1': 2, 'a|b|2': 3 }The function accepts the same options as flattenObject().
Examples
var Float64Array = require( '@stdlib/array-float64' );
var string2buffer = require( '@stdlib/buffer-from-string' );
var flattenObject = require( '@stdlib/utils-flatten-object' );
function noop() {
// Do nothing...
}
var obj = {
'a': {
'b': {
'beep': 'boop',
'foo': 'bar'
},
'c': [ 1, 2, 3 ],
'd': true,
'e': null,
'f': 3.14,
'g': new Date(),
'h': {
'bip': 6,
'bop': [ 4, 5, 6 ]
},
'i': [ null, true, {} ],
'j': /.*/,
'k': noop,
'l': NaN,
'm': [],
'n': string2buffer( 'hello' ),
'o': {
'data': new Float64Array( 10 )
},
'p': {
'1': {
'2': {
'3': {}
}
}
}
}
};
var out = flattenObject( obj, {
'depth': 5,
'copy': true,
'flattenArrays': false,
'delimiter': '-|-'
});
/* returns
{
'a-|-b-|-beep': 'boop',
'a-|-b-|-foo': 'bar',
'a-|-c': [1,2,3],
'a-|-d': true,
'a-|-e': null,
'a-|-f': 3.14,
'a-|-g': <Date>,
'a-|-h-|-bip': 6,
'a-|-h-|-bop': [4,5,6],
'a-|-i': [null,true,{}],
'a-|-j': <RegExp>,
'a-|-k': <Function>,
'a-|-l': NaN,
'a-|-m': [],
'a-|-n': <Buffer>,
'a-|-o-|-data': <Float64Array>,
'a-|-p-|-1-|-2-|-3': {}
}
*/See Also
-
@stdlib/utils-flatten-array: flatten an array.
Notice
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
Community
License
See LICENSE.
Copyright
Copyright © 2016-2024. The Stdlib Authors.