smart-array-filter
v4.0.2
Published
Filter an array of objects
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smart-array-filter
Filter an array of objects
Installation
npm install smart-array-filter
Documentation
Basic usage
const array = [
{
name: 'Cheetah',
lifeExpectancy: 10,
taxonomy: {
phylum: 'Chordata',
class: 'Mammalia',
order: 'Carnivora',
family: 'Felidae',
},
characteristics: {
prey: 'Gazelle, Wildebeest, Hare',
distinctiveFeature: 'Yellowish fur covered in small black spots',
},
locations: ['Africa', 'Asia', 'Eurasia'],
},
{
name: 'Gorilla',
lifeExpectancy: 40,
taxonomy: {
phylum: 'Chordata',
class: 'Mammalia',
order: 'Primates',
family: 'Hominidae',
},
locations: ['Africa'],
},
];
const filteredData = filter(array, {
keywords: 'gorilla', // search for any field that contains the "gorilla" string
});
Options
| Option | Type | Default | Description |
| --------------- | ---------------------- | ---------- | --------------------------------------------------------- |
| keywords
| string
or string[]
| []
| The list of keywords to search for. |
| limit
| number
| Infinity
| The maximum number of results to return. |
| caseSensitive
| boolean
| false
| Whether the search should be case sensitive. |
| predicate
| "AND"
or "OR"
| "AND"
| The predicate to use to combine matches between keywords. |
| depth
| number
| Infinity
| The depth to which the objects are inspected. |
| includePaths
| string[]
| []
| The paths to include when searching for matches. |
| ignorePaths
| string[]
| []
| The paths to ignore when searching for matches. |
Recursivity
By default, objects are inspected recursively. This means that if your data has circular references, it might throw a RangeError: Maximum call stack size exceeded
error.
To limit recursivity at a certain depth, you can set the depth
option.
Search within specific fields
To search within a specific key, you can prefix your search term with the field's key followed by a colon.
name:Gorilla
will match the name
field of the Gorilla entry.
order:Primates
will match the taxonomy.order
field of the Gorilla entry.
taxonomy.order
will match the taxonomy.order
field of the Gorilla entry.
You can use the includePaths
or the ignorePaths
options to define which fields should be included or ignored when finding search matches.
Keywords
The keywords option can be a string or an array of strings.
If it's a string it will be split by space / newlines and each part will be considered as a keyword. When searching for content with spaces or newlines, the content must be enclosed in double quotes.
- 🚫
{ keywords: 'distinctiveFeature:black spots' }
this creates 2 keywords - ✅
{ keywords: 'distinctiveFeature:"black spots"' }
If keywords
is an array of strings, each string will be considered as a keyword and there is no need for enclosing spaces in double quotes.
✅ { keywords: [ 'distinctiveFeature:black spots' ] }
Operators
- No operator:
name:Gori
will match the Gorilla entry because the name contains"Gori"
. - Strict equality:
name:=Gorilla
will match thename
, but notname:=Gorill
. - Range operators
>
,>=
,<
,<=
. Example:lifeExpectancy:>=40
..
to define a range. Example:lifeExpectancy:10..40
- The range operators also work with strings, using the ascii code.
- Negation:
-name:Gorilla
will match all entries except the ones which matchname:Gorilla
. This operator can be combined with other operators:-name:=Gorilla
.
Search within arrays
Arrays are traversed like objects, but inherit their parent's field name. For example in the Cheetah example, locations: ['Africa', 'Asia', 'Eurasia']
behaves as if there were 3 different properties but all with the locations
name.
Any of those keywords will match the Cheetah entry:
locations:Africa
, locations:Asia
, locations:Eurasia
Search predicate
By default, the search using the "AND"
predicate, which is returning the intersection of the matches across all keywords. You can change this behavior by setting the predicate
option to "OR"
.
filter(animals, {
keywords: ['Gorilla', 'Cheetah'],
predicate: 'OR', // will return the union of the matches on the "Gorilla" and "Cheetah" keywords
});