Curriculum Collections Iteration with range exercise 3 · mcq
Iteration with range
Now flip exercise 2 around: you want ONLY the index, no value. Pick
the idiomatic Go form.
TypeScript:
``ts
for (let i = 0; i < items.length; i++) {
console.log(i);
}
``
This is the form that bites exercise 2's trap-believers in reverse:
when you DO want just the index, the one-value form is the
RIGHT answer.
TypeScript reference
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.