mirror of
https://github.com/rjNemo/underscore
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Ruidy
bcb4dd1e9d
Add comprehensive documentation for all new functions: - TakeWhile: take elements while predicate is true - DropWhile: drop elements while predicate is true - Scan: running accumulator (prefix scan) - First/FirstN: get first element(s) safely - Init: all but last element - Intersperse: insert separator between elements - Sliding: sliding window views - FoldRight: right-to-left fold/reduce - Tap: side effects without mutation - Transpose: flip matrix rows/columns - Unzip: split tuples into separate slices - ParallelReduce: parallel reduction (experimental) - Replicate: create n copies of a value Each doc includes: - Clear description - Code examples with output - Common use cases - Edge case handling 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
31 lines
505 B
Markdown
31 lines
505 B
Markdown
---
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title: "First"
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date: 2025-01-16T00:00:00-00:00
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---
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`First` returns the first element of the slice. Returns an error if the slice is empty.
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```go
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package main
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import (
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"fmt"
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u "github.com/rjNemo/underscore"
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)
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func main() {
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nums := []int{1, 2, 3, 4, 5}
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first, err := u.First(nums)
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if err != nil {
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panic(err)
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}
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fmt.Println(first) // 1
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// Handle empty slice
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empty := []int{}
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_, err = u.First(empty)
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if err != nil {
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fmt.Println("Error:", err) // Error: underscore: empty slice
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}
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}
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```
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