JavaScript typing practice

Real JavaScript, typed exactly as written. Arrow functions and nested braces are the two patterns that slow most developers down.

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const active = users .filter((user) => user.status === "active") .map((user) => ({ id: user.id, name: user.name })) .sort((a, b) => a.name.localeCompare(b.name));

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Snippet: Array pipeline (javascript)

The JavaScript symbol profile

JavaScript leans hard on a handful of characters that barely appear in prose: parentheses, braces, the arrow made of hyphen and greater-than, backticks and the dollar-brace of template literals.

Arrow functions are the specific pattern worth drilling. The sequence of close-paren, space, hyphen, greater-than, space, open-brace involves four different fingers and two shift presses, and it appears constantly.

What to watch for

Transposed brackets - typing the closing character before the opening one - are the most common JavaScript typing error, and they are usually a rhythm problem rather than a knowledge problem.

The backtick is worth specific attention. It sits at the far top-left under the left little finger, is almost never used in prose, and appears in every template literal.

Common questions

Do I type the semicolons?

Type the snippet exactly as shown. The snippets here use semicolons, so yes - and the semicolon is a right-little-finger key that is worth the practice regardless of your style preference.

Keep going

Coding typing testA typing test using real source code. Measures code speed plus symbol, bracket and capitalisation accuracy separately from prose typing.Symbol typing practiceTargeted practice for brackets, operators, quotes and the shifted number row - the keys ordinary typing practice never trains.Python typing practicePractise typing real Python: colons, underscores, decorators, comprehensions and significant indentation.The full curriculumThirteen levels from posture to professional typing.