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Iterator: general refactoring and reset method (#193)

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Feature

Reset allows for the iteration process over a sequence to be restarted from the beginning.
It enables reusing the iterator for multiple traversals without needing to recreate it.

Refactoring

It is a idiomatic practice to design functions and methods to return concrete struct types.
This approach promotes flexibility and decoupling, allowing the calling code to work with any implementation that satisfies the interface
This commit is contained in:
donutloop
2024-02-29 04:30:12 +01:00
committed by GitHub
parent 0e1593c67b
commit 473f9c9f3e
3 changed files with 120 additions and 35 deletions
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14
iterator/operation_test.go
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@@ -21,7 +21,7 @@ func TestMapIterator(t *testing.T) {
assert := internal.NewAssert(t, "TestMapIterator")
iter := FromSlice([]int{1, 2, 3, 4})
var iter Iterator[int] = FromSlice([]int{1, 2, 3, 4})
iter = Map(iter, func(n int) int { return n / 2 })
@@ -34,7 +34,7 @@ func TestFilterIterator(t *testing.T) {
assert := internal.NewAssert(t, "TestFilterIterator")
iter := FromSlice([]int{1, 2, 3, 4})
var iter Iterator[int] = FromSlice([]int{1, 2, 3, 4})
iter = Filter(iter, func(n int) bool { return n < 3 })
@@ -47,10 +47,10 @@ func TestJoinIterator(t *testing.T) {
assert := internal.NewAssert(t, "TestJoinIterator")
iter1 := FromSlice([]int{1, 2})
iter2 := FromSlice([]int{3, 4})
var iter1 Iterator[int] = FromSlice([]int{1, 2})
var iter2 Iterator[int] = FromSlice([]int{3, 4})
iter := Join(iter1, iter2)
var iter Iterator[int] = Join(iter1, iter2)
item, ok := iter.Next()
assert.Equal(1, item)
@@ -64,7 +64,7 @@ func TestReduce(t *testing.T) {
assert := internal.NewAssert(t, "TestReduce")
iter := FromSlice([]int{1, 2, 3, 4})
var iter Iterator[int] = FromSlice([]int{1, 2, 3, 4})
sum := Reduce(iter, 0, func(a, b int) int { return a + b })
assert.Equal(10, sum)
}
@@ -74,7 +74,7 @@ func TestTakeIterator(t *testing.T) {
assert := internal.NewAssert(t, "TestTakeIterator")
iter := FromSlice([]int{1, 2, 3, 4, 5})
var iter Iterator[int] = FromSlice([]int{1, 2, 3, 4, 5})
iter = Take(iter, 3)