MISSION 1 OF 3

Find a spice jar

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Ruby track: BeginnerMission: BeginnerHashesSymbol keysLookup defaults

Before you start this beginner track

Variables, arrays, and key-value data. Collection blocks are a step beyond basic syntax.

Guided code reading and debugging. Runnable coding challenges are available in JavaScript, Python, and SQL.

0 / 6 challenges

KNOWLEDGE CHECK

Predict the result.

What two lines does the spice lookup print?

quest.rb

1spices = { cumin: "warm", mint: "cool" }2note = spices.fetch(:saffron, "unlisted")3puts note4puts spices.length

Each mission is an independent Ruby 3 or later script. Save as quest.rb and run ruby quest.rb. All methods are built into Ruby; no gems or external data are needed.

Review the lesson

A kitchen notebook stores tasting notes in a hash with symbol keys. fetch returns the value for a key, or its supplied fallback when that key is missing. Unlike assigning a missing entry, fetching does not change the notebook. length therefore still reports the original number of stored spices.

Choose your answer+25 XP on first completion

unlisted 2warm 2unlisted 3A KeyError is raised

Read the official language documentation

docs.ruby-lang.org/en/master/Hash.html docs.ruby-lang.org/en/master/Array.html docs.ruby-lang.org/en/master/String.html