What this snippet does
Promise.all rejects immediately if any promise rejects — use Promise.allSettled if you want all results regardless.
Expected output
[ 1, 2, 3 ] caught: fail
Why practise typing this
Typing promises 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
- promise basicsPromises · intermediate
- promise chainingPromises · intermediate
- Promise.allSettledPromises · intermediate
- race/anyPromises · intermediate
- let vs constVariables · beginner
- const configVariables · beginner