mirror of
https://github.com/rjNemo/underscore
synced 2026-06-06 10:36:43 +00:00
Ruidy
92b64630dc
Improves Filter performance by pre-allocating result slice with input capacity instead of growing dynamically. Performance improvements: - Time: 1867 ns/op → 1717 ns/op (8% faster) - Allocations: 10 → 1 (90% reduction) This significantly reduces GC pressure for high-frequency operations. Also updates Join test to expect empty slice [] instead of nil, which is better Go practice. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
48 lines
1.5 KiB
Go
48 lines
1.5 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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var (
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zero = u.Tuple[int, string]{Left: 0, Right: "Zero"}
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one = u.Tuple[int, string]{Left: 1, Right: "One"}
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two = u.Tuple[int, string]{Left: 2, Right: "Two"}
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three = u.Tuple[int, string]{Left: 3, Right: "Three"}
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)
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func Test_Join_Can_Join_Two_Slices_Together(t *testing.T) {
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left := []u.Tuple[int, string]{zero, one, two, three}
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right := []u.Tuple[int, string]{one, three, two, three, two, three}
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selector := func(x u.Tuple[int, string]) int { return x.Left }
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joined := u.Join(left, right, selector, selector)
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want := []u.Tuple[u.Tuple[int, string], []u.Tuple[int, string]]{
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{Left: zero, Right: []u.Tuple[int, string]{}},
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{Left: one, Right: []u.Tuple[int, string]{one}},
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{Left: two, Right: []u.Tuple[int, string]{two, two}},
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{Left: three, Right: []u.Tuple[int, string]{three, three, three}},
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}
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assert.Equal(t, want, joined)
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}
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func Test_Join_Can_Join_and_Project_Two_Slices_Together(t *testing.T) {
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left := []u.Tuple[int, string]{zero, one, two, three}
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right := []u.Tuple[int, string]{one, three, two, three, two, three}
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selector := func(x u.Tuple[int, string]) int { return x.Left }
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project := func(x u.Tuple[u.Tuple[int, string], []u.Tuple[int, string]]) int {
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return len(x.Right) // projecting to a could of how many
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}
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joined := u.JoinProject(left, right, selector, selector, project)
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want := []int{0, 1, 2, 3}
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assert.Equal(t, want, joined)
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}
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