JavaScript Snippet

Capitalize the First Letter

Difficulty: Easy

Capitalising the first letter of a string is a tiny task that hides several gotchas: empty inputs, multi-word phrases, and Unicode characters whose uppercase form is more than one code unit. This snippet starts with the obvious one-liner, hardens it against `null`/`undefined`/empty strings, then upgrades to a code-point-safe variant and finally a per-word title-case helper. Drop these in for form labels, headings, and CSV column titles.