Usage

`javascript
var deepSet = require( '@stdlib/utils-deep-set' );
`

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

Sets a nested property value.

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

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

console.log( obj );
// => { 'a': { 'b': { 'c': 'beep' } } }
`

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

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

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.

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

var bool = deepSet( arr, '1.a.0.x', 25 );
// returns true

console.log( arr );
/* =>
[
{ 'a': [ { 'x': 5 } ] },
{ 'a': [ { 'x': 25 } ] }
]
*/
`

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

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

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

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

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

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

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.

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

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

console.log( obj );
// => { 'a': { 'b': { 'c': 'beep' } } }
`

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

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

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

console.log( obj );
/* =>
{
'a': {
'b': {
'c': 'beep'
},
'e': {
'c': 'boop'
}
}
}
*/
`

#### deepSet.factory( path\[, options] )

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

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

#### dset( obj, value )

Sets a nested property value.

`javascript
var dset = deepSet.factory( 'a.b.c' );

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

var bool = dset( obj, 'beep' );
// returns true

console.log( obj );
// => { 'a': { 'b': { 'c': 'beep' } } }
`