Luau supports a concise declaration for array-like tables, {T} (for example, {string} is equivalent to {[number]: string} ); the more explicit definition of an indexer is still useful when the key isn’t a number, or when the table has other fields like { [number]: string, n: number } .
Why does it allow [number]: string, n: string, but not any of the others
Is there any way to allow any of the other variants or am I only able to do the bottom one for some reason? Ideally I could do the top-most one and define a mixed array.
Please paste the code into the post instead of only screenshotting next time.
You can’t explicitly define number index types. Instead of:
{1: string, 2: number}
{[1]: string, [2]: number}
do:
{[number]: string | number} --> a number index can have a string or number
{["1"]: string, ["2"]: number} --> you can, however, explicitly define string indexes (also known as string literals)
You can’t define types of indexes separated by a comma. Instead of:
{[string]: string, [number]: string}
do:
{[string | number]: string} --> index/key of number/string has a value type of string
The last example is correct. It can be a number array, with an explicit string key having a type of a value.
