arrays
countBy(array arr, function func)
Returns the number of items in arr that passes the condition of func.
The function func is expected to take the value as the first parameter (required).
Example
[
1,
2,
3,
4,
5
]
ds.arrays.countBy(payload, function(item) item > 2)
3
deepFlatten(array arr)
Given arr, which contains one level and multi level arrays, returns a flat array.
Example
[
[
1,
2
],
[
3,
4,
[
5,
6
]
]
]
ds.arrays.deepFlatten(payload)
[ 1, 2, 3, 4, 5, 6 ]
divideBy(array arr, number size)
Divides a single array arr into multiple arrays, limiting each one to size.
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.divideBy(payload, 2)
[
[
1,
2
],
[
3,
4
],
[
5
]
]
drop(array arr, number index)
Removes every item in arr until the specified index is reached.
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.drop(payload, 3)
[ 4, 5 ]
dropWhile(array arr, function func)
Removes every item in arr until func returns a false result, then stops.
The function func is expected to take the item as the first parameter (required).
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.dropWhile(payload, function(item) item < 3)
[ 3, 4, 5 ]
duplicates(array arr)
Returns the values that exist more than once in arr.
Example
[ 1, 1, 2 ]
ds.arrays.duplicates(payload)
[ 1 ]
removeDuplicates(array arr, function compF)
Removes any duplicates from the array and returns the resulting array. An optional comparator function takes two parameters.
Example
[ 1, 2, 2, 3, 4 ]
ds.arrays.removeDuplicates(payload)
[ 1, 2, 3, 4]
[
{
x: 1, y: "a"
},
{
x: 1, y: "b"
},
{
x: 2, y: "a"
},
{
x: 3, y: "a"
}
]
ds.arrays.removeDuplicates(payload, function(i1, i2) i1.x == i2.x)
[
{
x: 1, y: "a"
},
{
x: 2, y: "a"
},
{
x: 3, y: "a"
}
]
every(array arr, function func)
Returns true if every value arr returns true in func.
The function func is expected to take the item as the first parameter (required).
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.every(payload, function(item) item > 0)
true
firstWith(array arr, function func)
Returns the first value that passes the condition of func then stops.
The function func is expected to take the value as the first parameter (required) and the index as the second (optional).
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.firstWith(payload, function(item,index) item == index + 1)
1
indexOf(array arr, any value)
Returns the current index of the matching value in arr.
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.indexOf(payload, 3)
2
indexWhere(array arr, function func)
Returns the first index where the condition of func passes.
The function func is expected to take the item as the first parameter (required).
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.indexWhere(payload, function(item) item == 3)
2
join(array arrL, array arrR, function funcL, function funcR)
Joins two arrays together, returns the items of arrL with the items that match from arrR.
Both functions funcL and funcR are expected to take the item as the first parameter (required).
Example
{
"countries": [
{
"id": 1,
"name":"Spain"
},
{
"id": 2,
"name":"France"
},
{
"id": 3,
"name":"Germany"
}
],
"languages": [
{
"countryId": 1,
"name":"Spanish"
},
{
"countryId": 2,
"name":"French"
},
{
"countryId": 4,
"name":"Danish"
}
]
}
ds.arrays.join(
payload.countries,
payload.languages,
function(item) item.id,
function(item) item.countryId
)
[
{
"r": {
"countryId": 1,
"name": "Spanish"
},
"l": {
"id": 1,
"name": "Spain"
}
},
{
"r": {
"countryId": 2,
"name": "French"
},
"l": {
"id": 2,
"name": "France"
}
}
]
leftJoin(array arrL, array arrR, function funcL, function funcR)
Joins two arrays together, returns all of the items of arrL, with the items that match from arrR.
Both functions funcL and funcR are expected to take the item as the first parameter (required).
Example
{
"countries": [
{
"id": 1,
"name":"Spain"
},
{
"id": 2,
"name":"France"
},
{
"id": 3,
"name":"Germany"
}
],
"languages": [
{
"countryId": 1,
"name":"Spanish"
},
{
"countryId": 2,
"name":"French"
},
{
"countryId": 4,
"name":"Danish"
}
]
}
ds.arrays.leftJoin(
payload.countries,
payload.languages,
function(item) item.id,
function(item) item.countryId
)
[
{
"r": {
"countryId": 1,
"name": "Spanish"
},
"l": {
"id": 1,
"name": "Spain"
}
},
{
"r": {
"countryId": 2,
"name": "French"
},
"l": {
"id": 2,
"name": "France"
}
},
{
"l": {
"id": 3,
"name": "Germany"
}
}
]
outerJoin(array arrL, array arrR, function funcL, function funcR)
Joins two arrays together, returns the items of arrL with the items that match from arrR, the items from arrL that don’t have matches, and items from arrR that don’t have matches.
Both functions funcL and funcR are expected to take the item as the first parameter (required).
Example
{
"countries": [
{
"id": 1,
"name":"Spain"
},
{
"id": 2,
"name":"France"
},
{
"id": 3,
"name":"Germany"
}
],
"languages": [
{
"countryId": 1,
"name":"Spanish"
},
{
"countryId": 2,
"name":"French"
},
{
"countryId": 4,
"name":"Danish"
}
]
}
ds.arrays.outerJoin(
payload.countries,
payload.languages,
function(item) item.id,
function(item) item.countryId
)
[
{
"r": {
"countryId": 1,
"name": "Spanish"
},
"l": {
"id": 1,
"name": "Spain"
}
},
{
"r": {
"countryId": 2,
"name": "French"
},
"l": {
"id": 2,
"name": "France"
}
},
{
"l": {
"id": 3,
"name": "Germany"
}
},
{
"r": {
"countryId": 4,
"name": "Danish"
}
}
]
occurrences(array arr, function func)
Returns an object where the keys of the object are the result of func and the values of the object indicate how many times the key occurs in arr.
The function func is expected to take the value as the first parameter (required).
Example
[ "a", "a", "b", "b", "b", "c" ]
ds.arrays.occurrences(payload, function(item) item)
{
"a": 2,
"b": 3,
"c": 1
}
partition(array arr, function func)
Splits arr into two arrays of successes and failures from the results of func.
The function func is expected to take the value as the first parameter (required).
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.partition(payload, function(item) item > 3)
{
"success": [
4,
5
],
"failure": [
1,
2,
3
]
}
slice(array arr, number start, number end)
Returns a subset of arr between the indexes of start and end.
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.slice(payload, 2, 4)
[ 3, 4 ]
some(array arr, function func)
Returns true if at least one item in arr passes the condition in func.
The function func is expected to take the item as the first parameter (required).
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.some(payload, function(item) item > 2)
true
splitAt(array arr, number index)
Splits arr into a left and right array based on the index.
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.splitAt(payload, 3)
{
"r": [
4,
5
],
"l": [
1,
2,
3
]
}
splitWhere(array arr, function func)
Splits arr into a left and right array based on the first index that returns true for func.
The function func is expected to take the item as the first parameter (required).
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.splitWhere(payload, function(item) item > 3)
{
"r": [
4,
5
],
"l": [
1,
2,
3
]
}
sumBy(array arr, function func)
Calculates the sum of arr by the function provided value.
The function func is expected to take the item as the first parameter (required).
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.sumBy(payload, function(item) item)
15
take(array arr, number index)
Returns all values from arr up to the index.
Example
[ 1, 2, 3, 4 ]
ds.arrays.take(payload, 3)
[ 1, 2, 3 ]
takeWhile(array arr, function func)
Takes all items from the array while func is true. Stops at the first false value.
The function func is expected to take the value as the first parameter (required).
Example
[ 1, 2, 3, 4, 5 ]
ds.arrays.takeWhile(payload, function(item) item < 3)
[ 1, 2 ]