01-strings

Exercise 01 - String manipulation

The scenario

Every tracking system in the park outputs raw text - sensor tags, ranger names, zone identifiers. Before any of it reaches the dashboard it needs cleaning up: shouting alerts in uppercase, whispering all-clears, formatting asset tags, searching for keywords, and pulling initials from personnel names.

You'll build five small string utility functions that could sit behind a real park console.

What you will build

All functions live in starter/strings.js.

Function	Description	Example
shout(str)	Uppercase the string and append !	shout('hello') → 'HELLO!'
whisper(str)	Lowercase the string and wrap in parentheses	whisper('DANGER') → '(danger)'
formatTag(id, zone)	Return "[id] zone" using a template literal	formatTag('TRX-001', 'North Ridge') → '[TRX-001] North Ridge'
containsWord(str, word)	Return true if str includes word	containsWord('Rex spotted', 'Rex') → true
initials(fullName)	Split on spaces, take the first character of each part, uppercase, join with dots, trailing dot	initials('Ellie Sattler') → 'E.S.'

Getting started

Open starter/strings.js. Each function is stubbed with the right signature - replace the body. Then run starter/index.js to see the results:

node starter/index.js

Verify

cd starter && pnpm install && pnpm test

The tests check normal input, mixed case, and multi-word names (including three-part names like 'Ian Malcolm Jr' → 'I.M.J.').

Hints

• .toUpperCase(), .toLowerCase(), .includes() are your main tools.
• Template literals (`[${id}] ${zone}`) make formatting cleaner than concatenation.
• For initials, .split(' ') gives you an array of name parts, then .map() and .join('.') do the rest.

Reference solution

solution/strings.js