Curriculum Collections Maps

Maps

map[K]V. Like a TS Record<K, V> or Map<K, V>. Lookup with comma-ok: v, ok := m[key]. Iteration order is undefined — every range yields a different ordering. Maps are reference types; passing a map to a function shares it.

exercises

10 ready

pick one

Declare an empty Go map you can write keys into immediately. Maps

pick one

Declare a Go map pre-populated with initial entries. Pick the

pick one

TypeScript: scores["nope"] gives undefined for a missing key.

pick one

Exercise 3 pinned the trap: missing-key lookup returns the zero value,

fill blanks

Translate the TS delete to Go. The Go builtin is a free-standing

fill blanks

Translate Object.keys(${name}).length to Go. The builtin you

type one line

Productive comma-ok: a getScore helper that returns the score

type one line

TS habit: const counts: Record<string, number> = {} and you can

write a program

Write a complete program that counts the occurrences of each

write a program

Maps in Go are reference types — passing a map to a function

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