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package funk
import (
"fmt"
"testing"
"github.com/stretchr/testify/assert"
)
func TestChain(t *testing.T) {
testCases := []struct {
In interface{}
Panic string
}{
// Check with array types
{In: []int{0, 1, 2}},
{In: []string{"aaa", "bbb", "ccc"}},
{In: []interface{}{0, false, "___"}},
// Check with map types
{In: map[int]string{0: "aaa", 1: "bbb", 2: "ccc"}},
{In: map[string]string{"0": "aaa", "1": "bbb", "2": "ccc"}},
{In: map[int]interface{}{0: 0, 1: false, 2: "___"}},
// Check with invalid types
{false, "Type bool is not supported by Chain"},
{0, "Type int is not supported by Chain"},
}
for idx, tc := range testCases {
t.Run(fmt.Sprintf("test case #%d", idx+1), func(t *testing.T) {
is := assert.New(t)
if tc.Panic != "" {
is.PanicsWithValue(tc.Panic, func() {
Chain(tc.In)
})
return
}
chain := Chain(tc.In)
collection := chain.(*chainBuilder).collection
is.Equal(collection, tc.In)
})
}
}
func TestLazyChain(t *testing.T) {
testCases := []struct {
In interface{}
Panic string
}{
// Check with array types
{In: []int{0, 1, 2}},
{In: []string{"aaa", "bbb", "ccc"}},
{In: []interface{}{0, false, "___"}},
// Check with map types
{In: map[int]string{0: "aaa", 1: "bbb", 2: "ccc"}},
{In: map[string]string{"0": "aaa", "1": "bbb", "2": "ccc"}},
{In: map[int]interface{}{0: 0, 1: false, 2: "___"}},
// Check with invalid types
{false, "Type bool is not supported by LazyChain"},
{0, "Type int is not supported by LazyChain"},
}
for idx, tc := range testCases {
t.Run(fmt.Sprintf("test case #%d", idx+1), func(t *testing.T) {
is := assert.New(t)
if tc.Panic != "" {
is.PanicsWithValue(tc.Panic, func() {
LazyChain(tc.In)
})
return
}
chain := LazyChain(tc.In)
collection := chain.(*lazyBuilder).exec()
is.Equal(collection, tc.In)
})
}
}
func TestLazyChainWith(t *testing.T) {
testCases := []struct {
In func() interface{}
Panic string
}{
// Check with array types
{In: func() interface{} { return []int{0, 1, 2} }},
{In: func() interface{} { return []string{"aaa", "bbb", "ccc"} }},
{In: func() interface{} { return []interface{}{0, false, "___"} }},
// Check with map types
{In: func() interface{} { return map[int]string{0: "aaa", 1: "bbb", 2: "ccc"} }},
{In: func() interface{} { return map[string]string{"0": "aaa", "1": "bbb", "2": "ccc"} }},
{In: func() interface{} { return map[int]interface{}{0: 0, 1: false, 2: "___"} }},
// Check with invalid types
{
In: func() interface{} { return false },
Panic: "Type bool is not supported by LazyChainWith generator",
},
{
In: func() interface{} { return 0 },
Panic: "Type int is not supported by LazyChainWith generator",
},
}
for idx, tc := range testCases {
t.Run(fmt.Sprintf("test case #%d", idx+1), func(t *testing.T) {
is := assert.New(t)
if tc.Panic != "" {
is.PanicsWithValue(tc.Panic, func() {
LazyChainWith(tc.In).(*lazyBuilder).exec()
})
return
}
chain := LazyChainWith(tc.In)
collection := chain.(*lazyBuilder).exec()
is.Equal(collection, tc.In())
})
}
}
func ExampleChain() {
v := []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
chain := Chain(v)
lazy := LazyChain(v)
// Without builder
a := Filter(v, func(x int) bool { return x%2 == 0 })
b := Map(a, func(x int) int { return x * 2 })
c := Reverse(a)
fmt.Printf("funk.Contains(b, 2): %v\n", Contains(b, 2)) // false
fmt.Printf("funk.Contains(b, 4): %v\n", Contains(b, 4)) // true
fmt.Printf("funk.Sum(b): %v\n", Sum(b)) // 40
fmt.Printf("funk.Head(b): %v\n", Head(b)) // 4
fmt.Printf("funk.Head(c): %v\n\n", Head(c)) // 8
// With simple chain builder
ca := chain.Filter(func(x int) bool { return x%2 == 0 })
cb := ca.Map(func(x int) int { return x * 2 })
cc := ca.Reverse()
fmt.Printf("chainB.Contains(2): %v\n", cb.Contains(2)) // false
fmt.Printf("chainB.Contains(4): %v\n", cb.Contains(4)) // true
fmt.Printf("chainB.Sum(): %v\n", cb.Sum()) // 40
fmt.Printf("chainB.Head(): %v\n", cb.Head()) // 4
fmt.Printf("chainC.Head(): %v\n\n", cc.Head()) // 8
// With lazy chain builder
la := lazy.Filter(func(x int) bool { return x%2 == 0 })
lb := la.Map(func(x int) int { return x * 2 })
lc := la.Reverse()
fmt.Printf("lazyChainB.Contains(2): %v\n", lb.Contains(2)) // false
fmt.Printf("lazyChainB.Contains(4): %v\n", lb.Contains(4)) // true
fmt.Printf("lazyChainB.Sum(): %v\n", lb.Sum()) // 40
fmt.Printf("lazyChainB.Head(): %v\n", lb.Head()) // 4
fmt.Printf("lazyChainC.Head(): %v\n", lc.Head()) // 8
}
type updatingStruct struct {
x []int
}
func (us *updatingStruct) Values() interface{} {
return us.x
}
func ExampleLazyChain() {
us := updatingStruct{}
chain := Chain(us.x).
Map(func(x int) float64 { return float64(x) * 2.5 })
lazy := LazyChain(us.x).
Map(func(x int) float64 { return float64(x) * 2.5 })
lazyWith := LazyChainWith(us.Values).
Map(func(x int) float64 { return float64(x) * 2.5 })
fmt.Printf("chain.Sum(): %v\n", chain.Sum()) // 0
fmt.Printf("lazy.Sum(): %v\n", lazy.Sum()) // 0
fmt.Printf("lazyWith.Sum(): %v\n\n", lazyWith.Sum()) // 0
us.x = append(us.x, 2)
fmt.Printf("chain.Sum(): %v\n", chain.Sum()) // 0
fmt.Printf("lazy.Sum(): %v\n", lazy.Sum()) // 0
fmt.Printf("lazyWith.Sum(): %v\n\n", lazyWith.Sum()) // 5
us.x = append(us.x, 10)
fmt.Printf("chain.Sum(): %v\n", chain.Sum()) // 0
fmt.Printf("lazy.Sum(): %v\n", lazy.Sum()) // 0
fmt.Printf("lazyWith.Sum(): %v\n\n", lazyWith.Sum()) // 30
}
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