What this snippet does
keys/values/entries return arrays letting you use array methods like map and filter on object data.
Expected output
[ 'alice', 'bob', 'carol' ] [ 95, 87, 92 ] [ [ 'alice', 95 ], [ 'bob', 87 ], [ 'carol', 92 ] ]
Why practise typing this
Typing objects code builds muscle memory for the symbols and indentation JavaScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More JavaScript practice
- object literalsObjects · beginner
- computed keysObjects · intermediate
- getters/settersObjects · intermediate
- object transformObjects · intermediate
- Object.freezeObjects · intermediate
- object spreadObjects · beginner