What this snippet does
?? differs from || by only treating null and undefined as missing — 0, '', and false are valid values.
Expected output
default default 0 false
Why practise typing this
Typing operators 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
- strict equalityOperators · beginner
- logical operatorsOperators · beginner
- nullish defaultsOperators · beginner
- optional chainingOperators · beginner
- nested accessOperators · intermediate
- logical assignmentOperators · intermediate