Awesome
Fable.Fable.Linq
Usage
open Fable.Linq.Main
Minimal example
open Fable.Linq.Main
module Fable.Linq.Tests
open Fable.Core
open Fable.Linq.Main
open Fable.Core.Testing
[<Global>]
let it (msg: string) (f: unit->unit): unit = jsNative
type Foo = {
bar: int
}
it "where works" <| fun () ->
let x = [1;2;3;4;5;6;7;8]
let y = fablequery {
for s in x do
where (s > 5)
}
Assert.AreEqual(y.Length, 3)
it "select works" <| fun () ->
let x = [4;5;9;7;8]
let y = fablequery {
for s in x do
select {
bar = s
}
}
Assert.AreEqual(y.[0].bar, 4)
Assert.AreEqual(y.[1].bar, 5)
Assert.AreEqual(y.[2].bar, 9)
Assert.AreEqual(y.[3].bar, 7)
Assert.AreEqual(y.[4].bar, 8)
it "sortBy works" <| fun () ->
let x = [4;7;9;5;8]
let y = fablequery {
for s in x do
sortBy s
select {
bar = s
}
}
Assert.AreEqual(y.[0].bar, 4)
Assert.AreEqual(y.[1].bar, 5)
Assert.AreEqual(y.[2].bar, 7)
Assert.AreEqual(y.[3].bar, 8)
Assert.AreEqual(y.[4].bar, 9)
it "thenBy works" <| fun () ->
let x = [4;7;9;5;8]
let y = fablequery {
for s in x do
thenBy s
select {
bar = s
}
}
Assert.AreEqual(y.[0].bar, 4)
Assert.AreEqual(y.[1].bar, 5)
Assert.AreEqual(y.[2].bar, 7)
Assert.AreEqual(y.[3].bar, 8)
Assert.AreEqual(y.[4].bar, 9)
it "sortBy descending works" <| fun () ->
let x = [4;7;9;5;8]
let y = fablequery {
for s in x do
sortByDescending s
select {
bar = s
}
}
Assert.AreEqual(y.[4].bar, 4)
Assert.AreEqual(y.[3].bar, 5)
Assert.AreEqual(y.[2].bar, 7)
Assert.AreEqual(y.[1].bar, 8)
Assert.AreEqual(y.[0].bar, 9)
it "thenBy descending works" <| fun () ->
let x = [4;7;9;5;8]
let y = fablequery {
for s in x do
thenByDescending s
select {
bar = s
}
}
Assert.AreEqual(y.[4].bar, 4)
Assert.AreEqual(y.[3].bar, 5)
Assert.AreEqual(y.[2].bar, 7)
Assert.AreEqual(y.[1].bar, 8)
Assert.AreEqual(y.[0].bar, 9)
it "sumBy works" <| fun () ->
let x = [{bar=1}; {bar=2}; {bar=3}]
let y = fablequery {
for s in x do
sumBy s.bar
}
Assert.AreEqual(y, 6)
let x = [1;2;3;4]
let y = fablequery {
for s in x do
sumBy s
}
Assert.AreEqual(y, 10)
it "groupBy works" <| fun () ->
let m = [{bar=1}; {bar=3}; {bar=2}; {bar=2}; {bar=3}; {bar=3}; ]
let y = fablequery {
for s in m do
groupBy s.bar
}
for x in y do
match x with
| (1, a) ->
Assert.AreEqual(a.Length, 1)
Assert.AreEqual(a.[0], m.[0])
| (2, b) ->
Assert.AreEqual(b.Length, 2)
Assert.AreEqual(List.contains m.[2] b, true)
Assert.AreEqual(List.contains m.[3] b, true)
| (3, c) ->
Assert.AreEqual(c.Length, 3)
Assert.AreEqual(List.contains m.[1] c, true)
Assert.AreEqual(List.contains m.[4] c, true)
Assert.AreEqual(List.contains m.[5] c, true)
it "all works" <| fun () ->
let x = [4;7;9;5;8]
let y = fablequery {
for s in x do
select {
bar = s
}
all (s.bar = 4)
}
Assert.AreEqual(y, false)
let m = [4;4;4;4;4]
let k = fablequery {
for s in m do
select {
bar = s
}
all (s.bar = 4)
}
Assert.AreEqual(k, true)
it "averageBy works" <| fun () ->
let x = [4;7;9;5;8]
let y = fablequery {
for s in x do
averageBy s
}
Assert.AreEqual(y, 33 / 5)
it "contains works" <| fun () ->
let x = [4;7;9;5;8]
let y = fablequery {
for s in x do
contains 4
}
Assert.AreEqual(y, true)
let y = fablequery {
for s in x do
contains 40
}
Assert.AreEqual(y, false)
it "count works" <| fun () ->
let x = [4;7;9;5;8]
let y = fablequery {
for s in x do
count
}
Assert.AreEqual(y, 5)
it "distinct works" <| fun () ->
let x = [1;1;2;2]
let y = fablequery {
for s in x do
distinct
}
Assert.AreEqual(y.Length, 2)
Assert.AreEqual(List.contains 1 y, true)
Assert.AreEqual(List.contains 2 y, true)
it "exactlyOne works" <| fun () ->
let x = [1]
let y = fablequery {
for s in x do
exactlyOne
}
Assert.AreEqual(y, 1)
it "exists works" <| fun () ->
let x = [1]
let y = fablequery {
for s in x do
exists (s=1)
}
let z = fablequery {
for s in x do
exists (s=2)
}
Assert.AreEqual(y, true)
Assert.AreEqual(z, false)
it "find works" <| fun () ->
let x = [1;2;3]
let y = fablequery {
for s in x do
find (s=1)
}
Assert.AreEqual(y, 1)
try
let z = fablequery {
for s in x do
find (s=4)
}
let s = Some z
Assert.AreEqual(false, true)
with
| _ -> Assert.AreEqual(true, true)
it "join works" <| fun () ->
let x = [{bar=1}; {bar=2};{bar=3};{bar=4}]
let y = [{bar=5}; {bar=2};{bar=3};{bar=4};{bar=3}]
let k = fablequery {
for s in x do
join m in y on (s.bar=m.bar)
select (s.bar, m)
}
for m in k do
match m with
| (4, a) ->
Assert.AreEqual(a, y.[3])
| (2, b) ->
Assert.AreEqual(b, y.[1])
| (3, c) ->
let a = (c = y.[2])
let b = (c = y.[4])
Assert.AreEqual(true, a || b)
| (1, c) ->
Assert.AreEqual(false, true)
| (5, c) ->
Assert.AreEqual(false, true)
it "leftOuterJoin works" <| fun () ->
let x = [{bar=1}; {bar=2};{bar=3};{bar=4}]
let y = [{bar=5}; {bar=2};{bar=3};{bar=4};{bar=3}]
let k = fablequery {
for s in x do
leftOuterJoin m in y on (s.bar=m.bar) into p
select (s.bar, p)
}
for m in k do
match m with
| (4, a) ->
Assert.AreEqual(a.[0], y.[3])
| (2, b) ->
Assert.AreEqual(b.[0], y.[1])
| (3, c) ->
Assert.AreEqual(c.[0], y.[2])
Assert.AreEqual(c.[1], y.[4])
| (1, c) ->
Assert.AreEqual(c.Length, 0)
it "groupJoin works" <| fun () ->
let x = [{bar=1}; {bar=2};{bar=3};{bar=4}]
let y = [{bar=5}; {bar=2};{bar=3};{bar=4};{bar=3}]
let k = fablequery {
for s in x do
leftOuterJoin m in y on (s.bar=m.bar) into p
select (s.bar, p)
}
for m in k do
match m with
| (4, a) ->
Assert.AreEqual(a.[0], y.[3])
| (2, b) ->
Assert.AreEqual(b.[0], y.[1])
| (3, c) ->
Assert.AreEqual(c.[0], y.[2])
Assert.AreEqual(c.[1], y.[4])
| (1, c) ->
Assert.AreEqual(c.Length, 0)
it "groupValBy works" <| fun () ->
let x = [{bar=1}; {bar=2};{bar=2};{bar=3};{bar=3};{bar=3}]
let k = fablequery {
for s in x do
groupValBy s s.bar into p
select p
}
for m in k do
match m with
| (2, b) ->
Assert.AreEqual(b.Length, 2)
Assert.AreEqual(List.contains x.[1] b, true)
Assert.AreEqual(List.contains x.[2] b, true)
| (3, c) ->
Assert.AreEqual(c.Length, 3)
Assert.AreEqual(List.contains x.[3] c, true)
Assert.AreEqual(List.contains x.[4] c, true)
Assert.AreEqual(List.contains x.[5] c, true)
| (1, c) ->
Assert.AreEqual(c.Length, 1)
Assert.AreEqual(x.[0], c.[0])
it "minBy works" <| fun () ->
let x = [{bar=2};{bar=2};{bar=3};{bar=1}; {bar=3};{bar=3}]
let k = fablequery {
for s in x do
minBy s.bar
}
Assert.AreEqual(k, x.[3])
it "maxBy works" <| fun () ->
let x = [{bar=2};{bar=2};{bar=3};{bar=1}; {bar=3};{bar=3}]
let k = fablequery {
for s in x do
maxBy s.bar
}
Assert.AreEqual(k, x.[5])
it "head works" <| fun () ->
let x = [{bar=2};{bar=2};{bar=3};{bar=1}; {bar=3};{bar=3}]
let k = fablequery {
for s in x do
head
}
Assert.AreEqual(k, x.[0])
it "last works" <| fun () ->
let x = [{bar=2};{bar=2};{bar=3};{bar=1}; {bar=3};{bar=3}]
let k = fablequery {
for s in x do
last
}
Assert.AreEqual(k, x.[5])
it "skip works" <| fun () ->
let x = [{bar=2};{bar=2};{bar=3};{bar=1}; {bar=3};{bar=3}]
let k = fablequery {
for s in x do
skip 3
}
Assert.AreEqual(k.Length, 3)
Assert.AreEqual(k.[0], x.[3])
Assert.AreEqual(k.[1], x.[4])
Assert.AreEqual(k.[2], x.[5])
it "skipWhile works" <| fun () ->
let x = [1.;2.;3.;4.]
let k = fablequery {
for s in x do
skipWhile (s <= 3.)
}
Assert.AreEqual(k.Length, 1)
Assert.AreEqual(k.[0], x.[3])
it "take works" <| fun () ->
let x = [{bar=2};{bar=2};{bar=3};{bar=1}; {bar=3};{bar=3}]
let k = fablequery {
for s in x do
take 3
}
Assert.AreEqual(k.Length, 3)
Assert.AreEqual(k.[0], x.[0])
Assert.AreEqual(k.[1], x.[1])
Assert.AreEqual(k.[2], x.[2])
it "takeWhile works" <| fun () ->
let x = [1.;2.;3.;4.]
let k = fablequery {
for s in x do
takeWhile (s <= 3.)
}
Assert.AreEqual(k.Length, 3)
Assert.AreEqual(k.[0], x.[0])
Assert.AreEqual(k.[1], x.[1])
Assert.AreEqual(k.[2], x.[2])
it "nth works" <| fun () ->
let x = [{bar=2};{bar=2};{bar=3};{bar=1}; {bar=3};{bar=3}]
let k = fablequery {
for s in x do
nth 3
}
Assert.AreEqual(k, x.[3])
Building
Make sure the following requirements are installed in your system:
- dotnet SDK 2.0 or higher
- node.js 6.11 or higher
- yarn
- Mono if you're on Linux or macOS.
Then you just need to type ./build.cmd or ./build.sh