Haskell style valid braces kata but in JavaScript! 🥷🏻

index.js

const validBraces = (str) => ![...str].reduceRight(collapse, []).join('')
const collapse = ([head, ...tail], val) => {
  switch (val) {
    case '(':
      return head === ')' ? tail : [val, head, ...tail]
    case '{':
      return head === '}' ? tail : [val, head, ...tail]
    case '[':
      return head === ']' ? tail : [val, head, ...tail]
    default:
      return [val, head, ...tail]
  }
}