obop

MongoDB-style object operators makes array manipulation easy: where/order/update/view

SYNOPSIS

1import obop from "obop";
2
3const array = [{a: 1}, {a: 2}, {a: 3}];
4
5const out = obop.where(array, {a: 2}); // => [ { a: 2 } ]
6
7const out = array.filter(obop.where({a: 2})); // => [ { a: 2 } ]

Alternatively, you can generate the original obop function via the default export.

1import obopInit from "obop";
2
3const obop = obopInit();
4
5const out = obop.where(array, {a: 2}); // => [ { a: 2 } ]

CommonJS

1const obop = require('obop')();
2
3const out = obop.where(array, {a: 2}); // => [ { a: 2 } ]

Browser Environment

1<script src="obop.min.js"></script>
2<script>
3    const array = [{a: 1}, {a: 2}, {a: 3}];
4    const out = obop.where(array, {a: 2}); // => [ { a: 2 } ]
5</script>

Download obop.min.js browser build of this module.

METHODS

See document for more detail.

Query Selectors

where() method supports the following query selectors:

1{ field: value }                            // equal to
2{ field: { $gt: value } }                   // greater than
3{ field: { $gte: value } }                  // greater than or equal to
4{ field: { $in: [value1, value2, ... ] } }  // in
5{ field: { $lt: value } }                   // less than
6{ field: { $lte: value } }                  // less than or equal to
7{ field: { $ne: value } }                   // not equal to
8{ field: { $nin: [ value1, value2 ... ]} }  // not in
9{ $or: [ { query1 }, { qury2 }, ... ] }     // logical OR
10{ $and: [ { query1 }, { query2 }, ... ] }   // logical AND
11{ field: { $not: { query } } }              // not
12{ field: { $exists: boolean } }             // exists
13{ field: { $size: value } }                 // array size

Example:

1const out1 = obop.where(array1, {genre: 'fruit', price: {$gt: 100, $gt: 200}});
2const out2 = obop.where(array2, {'review.score': {$gte: 4.0}});
3
4// OR
5const out1 = array1.filter(obop.where({genre: 'fruit', price: {$gt: 100, $gt: 200}}));
6const out2 = array2.filter(obop.where({'review.score': {$gte: 4.0}}));

Sort Parameters

order() method supports the following styles of sort parameters:

1{ field: 1 }                                // ascending
2{ field: -1 }                               // descending
3{ field1: 1, field2: -1, ... }              // combination
4[ [ 'field1', 1 ], [ 'field2', -1 ], ... ]  // array style

Example:

1obop.order(array1, {price: 1, stock: -1});
2obop.order(array2, [['price', 1], ['stock', -1]]); // same as above
3
4// OR
5array1.sort(obop.order({price: 1, stock: -1}));
6array2.sort(obop.order([['price', 1], ['stock', -1]])); // same as above

Update Operators

update() method supports the following update operators:

1{ $set: { field: value } }                  // set value
2{ $unset: { field: '' } }                   // remove field
3{ $rename: { oldname: newname } }           // rename field
4{ $inc: { field: amount } }                 // increment value
5{ $pull: { field: query } }                 // remove item from array
6{ $push: { field: value } }                 // add item to array

Example:

1obop.update(array1, {$inc: {stock: -1}, $set: {'review.score': 4}});
2obop.update(array2, {$unset: {order: ''}});
3
4// OR
5array1.forEach(obop.update({$inc: {stock: -1}, $set: {'review.score': 4}}));
6array2.forEach(obop.update({$unset: {order: ''}}));

Projection Parameters

view() method supports the following styles of projection parameters:

1{ field1: 1 }                               // output fields1 only
2{ field1: 1, field2: 1, ... }               // output fields1, 2 and more
3{ field1: 0 }                               // output all fields except for fields1
4{ field1: 0, field2: 0, ... }               // except fields1, 2 and more

Example:

1const out1 = obop.view(array1, {name: 1, price: 1, stock: 1});  // include fields
2const out2 = obop.view(array2, {_id: 0, secret: 0});            // exclude fields
3
4// OR
5const out1 = array1.map(obop.view({name: 1, price: 1, stock: 1}));  // include fields
6const out2 = array2.map(obop.view({_id: 0, secret: 0}));            // exclude fields

LINKS

• https://cdn.jsdelivr.net/npm/obop/build/obop.min.js
• https://github.com/kawanet/obop
• https://www.npmjs.com/package/obop

LICENCE

Copyright 2013-2024 @kawanet

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.