export function trim (str) {
  if (!str) return str
  return str.replace(/^\s+|\s+$/g, '')
}


export function toCommaList (arr, key = 'name') {
  if (!arr) return
  return arr.map(item => item[key]).join(', ')
}


export function shuffle (a) {
  let j, x, i
  for (i = a.length - 1; i > 0; i--) {
    j = Math.floor(Math.random() * (i + 1))
    x = a[i]
    a[i] = a[j]
    a[j] = x
  }
  return a
}