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slice_example_test.go
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slice_example_test.go
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package lo
import (
"fmt"
"math"
"strconv"
)
func ExampleFilter() {
list := []int64{1, 2, 3, 4}
result := Filter(list, func(nbr int64, index int) bool {
return nbr%2 == 0
})
fmt.Printf("%v", result)
// Output: [2 4]
}
func ExampleMap() {
list := []int64{1, 2, 3, 4}
result := Map(list, func(nbr int64, index int) string {
return strconv.FormatInt(nbr*2, 10)
})
fmt.Printf("%v", result)
// Output: [2 4 6 8]
}
func ExampleFilterMap() {
list := []int64{1, 2, 3, 4}
result := FilterMap(list, func(nbr int64, index int) (string, bool) {
return strconv.FormatInt(nbr*2, 10), nbr%2 == 0
})
fmt.Printf("%v", result)
// Output: [4 8]
}
func ExampleFlatMap() {
list := []int64{1, 2, 3, 4}
result := FlatMap(list, func(nbr int64, index int) []string {
return []string{
strconv.FormatInt(nbr, 10), // base 10
strconv.FormatInt(nbr, 2), // base 2
}
})
fmt.Printf("%v", result)
// Output: [1 1 2 10 3 11 4 100]
}
func ExampleReduce() {
list := []int64{1, 2, 3, 4}
result := Reduce(list, func(agg int64, item int64, index int) int64 {
return agg + item
}, 0)
fmt.Printf("%v", result)
// Output: 10
}
func ExampleReduceRight() {
list := [][]int{{0, 1}, {2, 3}, {4, 5}}
result := ReduceRight(list, func(agg []int, item []int, index int) []int {
return append(agg, item...)
}, []int{})
fmt.Printf("%v", result)
// Output: [4 5 2 3 0 1]
}
func ExampleForEach() {
list := []int64{1, 2, 3, 4}
ForEach(list, func(x int64, _ int) {
fmt.Println(x)
})
// Output:
// 1
// 2
// 3
// 4
}
func ExampleTimes() {
result := Times(3, func(i int) string {
return strconv.FormatInt(int64(i), 10)
})
fmt.Printf("%v", result)
// Output: [0 1 2]
}
func ExampleUniq() {
list := []int{1, 2, 2, 1}
result := Uniq(list)
fmt.Printf("%v", result)
// Output: [1 2]
}
func ExampleUniqBy() {
list := []int{0, 1, 2, 3, 4, 5}
result := UniqBy(list, func(i int) int {
return i % 3
})
fmt.Printf("%v", result)
// Output: [0 1 2]
}
func ExampleGroupBy() {
list := []int{0, 1, 2, 3, 4, 5}
result := GroupBy(list, func(i int) int {
return i % 3
})
fmt.Printf("%v\n", result[0])
fmt.Printf("%v\n", result[1])
fmt.Printf("%v\n", result[2])
// Output:
// [0 3]
// [1 4]
// [2 5]
}
func ExampleChunk() {
list := []int{0, 1, 2, 3, 4}
result := Chunk(list, 2)
for _, item := range result {
fmt.Printf("%v\n", item)
}
// Output:
// [0 1]
// [2 3]
// [4]
}
func ExamplePartitionBy() {
list := []int{-2, -1, 0, 1, 2, 3, 4}
result := PartitionBy(list, func(x int) string {
if x < 0 {
return "negative"
} else if x%2 == 0 {
return "even"
}
return "odd"
})
for _, item := range result {
fmt.Printf("%v\n", item)
}
// Output:
// [-2 -1]
// [0 2 4]
// [1 3]
}
func ExampleFlatten() {
list := [][]int{{0, 1, 2}, {3, 4, 5}}
result := Flatten(list)
fmt.Printf("%v", result)
// Output: [0 1 2 3 4 5]
}
func ExampleInterleave() {
list1 := [][]int{{1, 4, 7}, {2, 5, 8}, {3, 6, 9}}
list2 := [][]int{{1}, {2, 5, 8}, {3, 6}, {4, 7, 9, 10}}
result1 := Interleave(list1...)
result2 := Interleave(list2...)
fmt.Printf("%v\n", result1)
fmt.Printf("%v\n", result2)
// Output:
// [1 2 3 4 5 6 7 8 9]
// [1 2 3 4 5 6 7 8 9 10]
}
func ExampleShuffle() {
list := []int{0, 1, 2, 3, 4, 5}
result := Shuffle(list)
fmt.Printf("%v", result)
}
func ExampleReverse() {
list := []int{0, 1, 2, 3, 4, 5}
result := Reverse(list)
fmt.Printf("%v", result)
// Output: [5 4 3 2 1 0]
}
func ExampleFill() {
list := []foo{{"a"}, {"a"}}
result := Fill(list, foo{"b"})
fmt.Printf("%v", result)
// Output: [{b} {b}]
}
func ExampleRepeat() {
result := Repeat(2, foo{"a"})
fmt.Printf("%v", result)
// Output: [{a} {a}]
}
func ExampleRepeatBy() {
result := RepeatBy(5, func(i int) string {
return strconv.FormatInt(int64(math.Pow(float64(i), 2)), 10)
})
fmt.Printf("%v", result)
// Output: [0 1 4 9 16]
}
func ExampleKeyBy() {
list := []string{"a", "aa", "aaa"}
result := KeyBy(list, func(str string) int {
return len(str)
})
fmt.Printf("%v", result)
// Output: map[1:a 2:aa 3:aaa]
}
func ExampleAssociate() {
list := []string{"a", "aa", "aaa"}
result := Associate(list, func(str string) (string, int) {
return str, len(str)
})
fmt.Printf("%v", result)
// Output: map[a:1 aa:2 aaa:3]
}
func ExampleDrop() {
list := []int{0, 1, 2, 3, 4, 5}
result := Drop(list, 2)
fmt.Printf("%v", result)
// Output: [2 3 4 5]
}
func ExampleDropRight() {
list := []int{0, 1, 2, 3, 4, 5}
result := DropRight(list, 2)
fmt.Printf("%v", result)
// Output: [0 1 2 3]
}
func ExampleDropWhile() {
list := []int{0, 1, 2, 3, 4, 5}
result := DropWhile(list, func(val int) bool {
return val < 2
})
fmt.Printf("%v", result)
// Output: [2 3 4 5]
}
func ExampleDropRightWhile() {
list := []int{0, 1, 2, 3, 4, 5}
result := DropRightWhile(list, func(val int) bool {
return val > 2
})
fmt.Printf("%v", result)
// Output: [0 1 2]
}
func ExampleDropByIndex() {
list := []int{0, 1, 2, 3, 4, 5}
result := DropByIndex(list, 2)
fmt.Printf("%v", result)
// Output: [0 1 3 4 5]
}
func ExampleReject() {
list := []int{0, 1, 2, 3, 4, 5}
result := Reject(list, func(x int, _ int) bool {
return x%2 == 0
})
fmt.Printf("%v", result)
// Output: [1 3 5]
}
func ExampleCount() {
list := []int{0, 1, 2, 3, 4, 5, 0, 1, 2, 3}
result := Count(list, 2)
fmt.Printf("%v", result)
// Output: 2
}
func ExampleCountBy() {
list := []int{0, 1, 2, 3, 4, 5, 0, 1, 2, 3}
result := CountBy(list, func(i int) bool {
return i < 4
})
fmt.Printf("%v", result)
// Output: 8
}
func ExampleCountValues() {
result1 := CountValues([]int{})
result2 := CountValues([]int{1, 2})
result3 := CountValues([]int{1, 2, 2})
result4 := CountValues([]string{"foo", "bar", ""})
result5 := CountValues([]string{"foo", "bar", "bar"})
fmt.Printf("%v\n", result1)
fmt.Printf("%v\n", result2)
fmt.Printf("%v\n", result3)
fmt.Printf("%v\n", result4)
fmt.Printf("%v\n", result5)
// Output:
// map[]
// map[1:1 2:1]
// map[1:1 2:2]
// map[:1 bar:1 foo:1]
// map[bar:2 foo:1]
}
func ExampleCountValuesBy() {
isEven := func(v int) bool {
return v%2 == 0
}
result1 := CountValuesBy([]int{}, isEven)
result2 := CountValuesBy([]int{1, 2}, isEven)
result3 := CountValuesBy([]int{1, 2, 2}, isEven)
length := func(v string) int {
return len(v)
}
result4 := CountValuesBy([]string{"foo", "bar", ""}, length)
result5 := CountValuesBy([]string{"foo", "bar", "bar"}, length)
fmt.Printf("%v\n", result1)
fmt.Printf("%v\n", result2)
fmt.Printf("%v\n", result3)
fmt.Printf("%v\n", result4)
fmt.Printf("%v\n", result5)
// Output:
// map[]
// map[false:1 true:1]
// map[false:1 true:2]
// map[0:1 3:2]
// map[3:3]
}
func ExampleSubset() {
list := []int{0, 1, 2, 3, 4, 5}
result := Subset(list, 2, 3)
fmt.Printf("%v", result)
// Output: [2 3 4]
}
func ExampleSlice() {
list := []int{0, 1, 2, 3, 4, 5}
result := Slice(list, 1, 4)
fmt.Printf("%v\n", result)
result = Slice(list, 4, 1)
fmt.Printf("%v\n", result)
result = Slice(list, 4, 5)
fmt.Printf("%v\n", result)
// Output:
// [1 2 3]
// []
// [4]
}
func ExampleReplace() {
list := []int{0, 1, 0, 1, 2, 3, 0}
result := Replace(list, 0, 42, 1)
fmt.Printf("%v\n", result)
result = Replace(list, -1, 42, 1)
fmt.Printf("%v\n", result)
result = Replace(list, 0, 42, 2)
fmt.Printf("%v\n", result)
result = Replace(list, 0, 42, -1)
fmt.Printf("%v\n", result)
// Output:
// [42 1 0 1 2 3 0]
// [0 1 0 1 2 3 0]
// [42 1 42 1 2 3 0]
// [42 1 42 1 2 3 42]
}
func ExampleReplaceAll() {
list := []string{"", "foo", "", "bar", ""}
result := Compact(list)
fmt.Printf("%v", result)
// Output: [foo bar]
}
func ExampleIsSorted() {
list := []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
result := IsSorted(list)
fmt.Printf("%v", result)
// Output: true
}
func ExampleIsSortedByKey() {
list := []string{"a", "bb", "ccc"}
result := IsSortedByKey(list, func(s string) int {
return len(s)
})
fmt.Printf("%v", result)
// Output: true
}