Curriculum Collections Iteration with range exercise 8 · fill-word
Iteration with range
Iterate over a map and print every key→value pair. Fill in the
two range variables in the correct order.
TypeScript:
``ts
for (const [k, v] of Object.entries(prices)) {
console.log(k, v);
}
`
Trap: TS .forEach((v, k) => ...)` puts value FIRST. Go's range
is the OPPOSITE — KEY first, value second.
TypeScript reference
Fill the blanks →
About this theme
for i, v := range collection is the workhorse. Over a slice you get (index, value). Over a map you get (key, value). Over a string you get (byteIndex, rune). Over a channel you get just the value, with no index. Use _ to discard either side.