Javascript library with SQL like syntax
This library inspired from the LINQ library from C# language for a code flow like SQL so you can filter, select and query your data (Array) in a fluent API
filters the array by a given filter function and return a new filtered array.
where(predicate)
predicate: [function] that returns a boolean
let arr = [1, 2, 3, 4, 5, 6];
var res = arr.where((curr) => curr % 2 == 0); //ouput: res = [2,4,6]groups the array by a given field. if the array is array of primitives than it will group them by thier value the value of the group will be the count of thier instances.
group(key)
key [optional]: [string] the name of the property to group by
let arr = [1, 1, 1, 2, 2, 3];
var res = arr.group(); //ouput: res = {1: 3,2: 2,3: 1}
// -- or
let arr = [{id:1, group: 'a'},{id:2, group: 'a'},{id:3, group: 'b'}]
var res = arr.group('group');
/*output: res = {
'a': [
{id:1, group: 'a'},
{id:2, group: 'a'}
],
'b': [
{id:3, group: 'b'}
]
}
*/projects the property selected
select(key)
key [optional]: [string] the name of the property to select
let arr = [{id:1, group: 'a'},{id:2, group: 'a'},{id:3, group: 'b'}]
var res = arr.select('id'); //ouput: res = [1,2,3]get the first element of the array without mutate it.
first()
let arr = [{id:1, group: 'a'},{id:2, group: 'a'},{id:3, group: 'b'}]
var res = arr.first(); //ouput: res = {id:1, group: 'a'}return true if any of the elements setisfy the condition
any(condition)
confition: [function] that returns true or false
let arr = [{id:1, group: 'a'},{id:2, group: 'a'},{id:3, group: 'b'}]
var res = arr.any( el => el.group === 'c' ); //ouput: res = falsereturn true if all of the elements setisfy the condition
all(condition)
confition: [function] that returns true or false
let arr = [{id:1, group: 'a'},{id:2, group: 'a'},{id:3, group: 'b'}]
var res = arr.all( el => el.id < 4 ); //ouput: res = truereturn a new array of ordered elements by the key in ascending order.
orderBy(key)
key [optional]: [function | string] the key or a function to order by the elements
let arr = [{id:1, group: 'a'},{id:3, group: 'a'},{id:2, group: 'b'}]
var res = arr.orderBy('id'); //ouput: res = [{id:1, group: 'a'},{id:2, group: 'b'},{id:3, group: 'a'}]
// -- or
let arr = [{id:1, group: 'a'},{id:3, group: 'a'},{id:2, group: 'b'}]
var res = arr.orderBy( (a,b) => a.id - b.id );
//ouput: res = [{id:1, group: 'a'},{id:2, group: 'b'},{id:3, group: 'a'}]
// -- or
let arr = [3,2,1]
var res = arr.orderBy(); // [1,2,3]the same usage as orderBy but order in descending order.
return the selected number of elements from the array as a new array.
take(amount)
amount: [number] the number of elements to take from the array, negative value will take from last of the array.
let arr = [1,2,3,4,5,6];
let res = arr.take(3); //output: res = [1,2,3]
// -- or
let arr = [1,2,3,4,5,6];
let res = arr.take(-3); //output: res = [4,5,6]
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