toLowerCase 不是函数

Question

How do I make this include words from the array that has uppercase letters?

const array = ["amassment", "amassments", "Amasta", "amasthenic", "amasty", "amastia", "AMAT", "Amata", "amate"]
const word = array.filter(m=> m.includes(args[0]))
const wrd = word.toLowerCase()

if(!wrd) return message.delete()

console.log(`${wrd}`)

When my args[0] is "am", it only sends "amassment" , "amassments" , "amasthenic" , "amasty" , "amastia" , "amate" . It doesn't include words in uppercase at all.
Even though I added the .toLowerCase() , I get an error word.toLowerCase() is not a function . I need help.

Answer 1

You have to call toLowerCase() inside filter function.

const word = array.filter(m=> m.toLowerCase().includes(args[0]))

If your args also needs to be lower cased and included, you can use the below approach to check

const word = array.filter(m=> m.match(new RegExp(args[0],"i")));