Go TutorialLesson 18Free preview

Go Maps

This lesson is part of Go · All levels

Summary

This lesson is about maps, a set of key-value pairs with key types that should be comparable. The map is created with make(map[kunci]value) or directly with literal, and then accessed via a key such as m["a"]. Since the map is a reference type, changes to the contents are immediately visible; use delete() to delete entries and the comma-ok to check the presence of the key.

Key points

Map is declared with map[Key]value and initialized make or literal
The key must be comparable; the value must be of any type
Delete(m, k) delete entries and len(m) count the number of entries
M[k] returns a zero value when the key is not present; check with v, ok:= m[k]

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