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list: Add LastIndexOfFunc and IndexOfFunc method (#48)

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* LastIndexOfFunc returns the index of the last occurrence of the value in this list satisfying f(data[i])
* IndexOfFunc returns the first index satisfying f(v)
This commit is contained in:
donutloop
2022-07-22 04:04:31 +02:00
committed by GitHub
parent a82b5dd206
commit ac3baac5c6
3 changed files with 110 additions and 0 deletions
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28
datastructure/list/list_test.go
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@@ -36,6 +36,17 @@ func TestIndexOf(t *testing.T) {
assert.Equal(-1, i)
}
func TestIndexOfFunc(t *testing.T) {
assert := internal.NewAssert(t, "TestIndexOf")
list := NewList([]int{1, 2, 3})
i := list.IndexOfFunc(func(a int) bool { return a == 1 })
assert.Equal(0, i)
i = list.IndexOfFunc(func(a int) bool { return a == 4 })
assert.Equal(-1, i)
}
func TestLastIndexOf(t *testing.T) {
assert := internal.NewAssert(t, "TestIndexOf")
@@ -53,6 +64,23 @@ func TestLastIndexOf(t *testing.T) {
assert.Equal(0, i)
}
func TestLastIndexOfFunc(t *testing.T) {
assert := internal.NewAssert(t, "TestIndexOf")
list := NewList([]int{1, 2, 3, 3, 3, 3, 4, 5, 6, 9})
i := list.LastIndexOfFunc(func(a int) bool { return a == 3 })
assert.Equal(5, i)
i = list.LastIndexOfFunc(func(a int) bool { return a == 10 })
assert.Equal(-1, i)
i = list.LastIndexOfFunc(func(a int) bool { return a == 4 })
assert.Equal(6, i)
i = list.LastIndexOfFunc(func(a int) bool { return a == 1 })
assert.Equal(0, i)
}
func TestContain(t *testing.T) {
assert := internal.NewAssert(t, "TestContain")