challenge.js

/**
 * Validate brackets
 * write a function that accepts a string and validates braces/brackets/parentheses
 * ‘(‘, ‘{‘, ‘[‘ are openers
 * ‘)’, ‘}’, ‘]’ closers
 * ‘{ [ }’ should return false
 * ‘{ [ ] ( ) }’ should return true
 **/

const signMap = {
    '}': '{',
    ')': '(',
    ']': '['
  }

const signs = {
  '{': 0,
  '(': 0,
  '[': 0
}

const input = '{[]()}'

const inputArray = input.split('')

for (let i in inputArray) {
  const ch = inputArray[i]

  const indicator = ch

  switch (ch) {
    case '(':
    case '{':
    case '[':
      signs[indicator]++
  }

  switch (ch) {
    case ')':
    case '}':
    case ']':
      if (signs[signMap[indicator]] > 0) {
        signs[signMap[indicator]]--
      } else {
        console.log('false')

        process.exit()
      }
  }
}

for (let i in signs) {
  if (signs[i] !== 0) {
    console.log('false')

    process.exit()
  }
}

console.log('true')

process.exit()