For extended documentation, checkout http://docs.mongodb.org/manual/reference/operator/query/
- Supported operators: $in, $nin, $exists, $gte, $gt, $lte, $lt, $eq, $neq, $mod, $all, $and, $or, $nor, $not, $size, $type, $regex
- Regexp searches
- Function filtering
- sub object searching
- dot notation searching
- Supports node.js, and web
- Small (2 kb minified) library
- Custom Expressions
var sift = require('sift');
//intersecting arrays
var sifted = sift({ $in: ['hello','world'] }, ['hello','sifted','array!']); //['hello']
//regexp filter
var sifted = sift(/^j/, ['craig','john','jake']); //['john','jake']
//A *sifter* is returned if the second parameter is omitted
var siftPeople = sift({
//you can also filter against functions
name: function(value) {
return value.length == 5;
}
});
//filtered: [{ name: 'craig' }]
siftPeople([{
name: 'craig',
},
{
name: 'john'
},
{
name: 'jake'
}]);
//you can test *single values* against your custom sifter
siftPeople.test({ name: 'sarah' }); //true
siftPeople.test({ name: 'tim' }); //false\<html>
<head>
<script src="https://raw.github.com/crcn/sift.js/master/sift.min.js" type="text/javascript"></script>
<script type="text/javascript">
//regexp filter
var sifted = sift(/^j/, ['craig','john','jake']); //['john','jake']
</script>
</head>
<body>
</body>
</html>filter- the filter to use against the target arrayarray- sifts against target array. Without this, a function is returnedselectorFn- selector for the values within the array.
With an array:
sift({$exists:true}, ['craig',null]); //['craig']Without an array, a sifter is returned:
var siftExists = sift({$exists:true});
siftExists(['craig',null]); //['craig']With a selector:
var sifter = sift({$exists:true}, function(user) {
return !!user.name;
});
sifter([
{
name: "Craig"
},
{
name: null
}
])With your sifter, you can also test values:
siftExists.test(null); //false
siftExists.test('craig'); //trueSee MongoDB's advanced queries for more info.
array value must be $in the given query:
Intersecting two arrays:
//filtered: ['Brazil']
sift({ $in: ['Costa Rica','Brazil'] }, ['Brazil','Haiti','Peru','Chile']); Here's another example. This acts more like the $or operator:
sift({ location: { $in: ['Costa Rica','Brazil'] } }, { name: 'Craig', location: 'Brazil' });Opposite of $in:
//filtered: ['Haiti','Peru','Chile']
sift({ $nin: ['Costa Rica','Brazil'] }, ['Brazil','Haiti','Peru','Chile']); Checks if whether a value exists:
//filtered: ['Craig','Tim']
sift({ $exists: true }, ['Craig',null,'Tim']); You can also filter out values that don't exist
//filtered: [{ name: 'Craig', city: 'Minneapolis' }]
sift({ city: { $exists: false } }, [ { name: 'Craig', city: 'Minneapolis' }, { name: 'Tim' }]); Checks if a number is >= value:
//filtered: [2, 3]
sift({ $gte: 2 }, [0, 1, 2, 3]); Checks if a number is > value:
//filtered: [3]
sift({ $gt: 2 }, [0, 1, 2, 3]); Checks if a number is <= value.
//filtered: [0, 1, 2]
sift({ $lte: 2 }, [0, 1, 2, 3]); Checks if number is < value.
//filtered: [0, 1]
sift({ $lt: 2 }, [0, 1, 2, 3]); Checks if query == value. Note that $eq can be omitted. For $eq, and $neq
//filtered: [{ state: 'MN' }]
sift({ state: {$eq: 'MN' }}, [{ state: 'MN' }, { state: 'CA' }, { state: 'WI' }); Or:
//filtered: [{ state: 'MN' }]
sift({ state: 'MN' }, [{ state: 'MN' }, { state: 'CA' }, { state: 'WI' }); Checks if query != value.
//filtered: [{ state: 'CA' }, { state: 'WI'}]
sift({ state: {$ne: 'MN' }}, [{ state: 'MN' }, { state: 'CA' }, { state: 'WI' }); Modulus:
//filtered: [300, 600]
sift({ $mod: [3, 0] }, [100, 200, 300, 400, 500, 600]); values must match everything in array:
//filtered: [ { tags: ['books','programming','travel' ]} ]
sift({ tags: {$all: ['books','programming'] }}, [
{ tags: ['books','programming','travel' ] },
{ tags: ['travel','cooking'] } ]); ability to use an array of expressions. All expressions must test true.
//filtered: [ { name: 'Craig', state: 'MN' }]
sift({ $and: [ { name: 'Craig' }, { state: 'MN' } ] }, [
{ name: 'Craig', state: 'MN' },
{ name: 'Tim', state: 'MN' },
{ name: 'Joe', state: 'CA' } ]); OR array of expressions.
//filtered: [ { name: 'Craig', state: 'MN' }, { name: 'Tim', state: 'MN' }]
sift({ $or: [ { name: 'Craig' }, { state: 'MN' } ] }, [
{ name: 'Craig', state: 'MN' },
{ name: 'Tim', state: 'MN' },
{ name: 'Joe', state: 'CA' } ]); opposite of or:
//filtered: [ { name: 'Tim', state: 'MN' }, { name: 'Joe', state: 'CA' }]
sift({ $nor: [ { name: 'Craig' }, { state: 'MN' } ] }, [
{ name: 'Craig', state: 'MN' },
{ name: 'Tim', state: 'MN' },
{ name: 'Joe', state: 'CA' } ]); Matches an array - must match given size:
//filtered: ['food','cooking']
sift({ tags: { $size: 2 } }, [ { tags: ['food','cooking'] }, { tags: ['traveling'] }]); Matches a values based on the type
sift({ $type: Date }, [new Date(), 4342, 'hello world']); //returns single date
sift({ $type: String }, [new Date(), 4342, 'hello world']); //returns ['hello world']Matches values based on the given regular expression
sift({ $regex: /^f/i, $nin: ["frank"] }, ["frank", "fred", "sam", "frost"]); // ["fred", "frost"]Not expression:
sift({$not:{$in:['craig','tim']}}, ['craig','tim','jake']); //['jake']
sift({$not:{$size:5}}, ['craig','tim','jake']); //['tim','jake']var people = [{
name: 'craig',
address: {
city: 'Minneapolis'
}
},
{
name: 'tim',
address: {
city: 'St. Paul'
}
}];
var sifted = sift({ address: { city: 'Minneapolis' }}, people); // count = 1
//or
var sifted = sift({'address.city': 'minneapolis'}, people);//count = 1You can add your own expressions. For instance - say you want to do some bitmask filtering, you could add this example:
sift.use({
operators: {
band: function(a, b) {
return (a & b) ? 0 : -1; // 0 = exists, -1 = doesn't exist
}
}
})
// ops
var IS_ANIMAL = 2,
IS_PERSON = IS_ANIMAL << 1,
IS_DOG = IS_PERSON << 1,
EATS_CEREAL = IS_DOG << 1,
EATS_BONES = EATS_CEREAL << 1;
sift({ $band: IS_PERSON }, [ S_PERSON|EATS_CEREAL, IS_DOG|EATS_BONES, IS_PERSON ]);