mirror of
https://github.com/rjNemo/underscore
synced 2026-06-06 02:26:42 +00:00
Ruidy
260c48e051
- Add Init: returns all elements except last, and the last element - Useful for destructuring lists from the right - Comprehensive tests including edge cases - Benchmark included Example: Init([1,2,3,4,5]) → ([1,2,3,4], 5) Resolves Issue 17 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude <noreply@anthropic.com>
65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package underscore_test
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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u "github.com/rjNemo/underscore"
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)
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func TestInit(t *testing.T) {
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nums := []int{1, 2, 3, 4, 5}
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init, last := u.Init(nums)
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assert.Equal(t, []int{1, 2, 3, 4}, init)
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assert.Equal(t, 5, last)
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}
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func TestInitEmpty(t *testing.T) {
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init, last := u.Init([]int{})
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assert.Equal(t, []int{}, init)
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assert.Equal(t, 0, last)
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}
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func TestInitSingleElement(t *testing.T) {
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init, last := u.Init([]int{42})
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assert.Equal(t, []int{}, init)
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assert.Equal(t, 42, last)
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}
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func TestInitTwoElements(t *testing.T) {
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init, last := u.Init([]int{1, 2})
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assert.Equal(t, []int{1}, init)
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assert.Equal(t, 2, last)
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}
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func TestInitStrings(t *testing.T) {
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words := []string{"hello", "world", "!"}
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init, last := u.Init(words)
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assert.Equal(t, []string{"hello", "world"}, init)
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assert.Equal(t, "!", last)
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}
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func TestInitDoesNotMutate(t *testing.T) {
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original := []int{1, 2, 3, 4, 5}
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init, last := u.Init(original)
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// Modify returned slice
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init[0] = 999
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// Original should be unchanged
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assert.Equal(t, 1, original[0])
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assert.Equal(t, 5, last)
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}
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func BenchmarkInit(b *testing.B) {
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nums := make([]int, 1000)
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for i := range nums {
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nums[i] = i
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}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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u.Init(nums)
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}
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}
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