export function isDef (v){
  return v !== undefined && v !== null
}

/**
 * Remove an item from an array.
 */
export function remove (arr, item) {
  if (arr.length) {
    const index = arr.indexOf(item)
    if (index > -1) {
      return arr.splice(index, 1)
    }
  }
}

export function isRegExp (v) {
  return _toString.call(v) === '[object RegExp]'
}

export function toFixed(value, bit) {
  const num = Math.pow(10, bit);
  return Math.round(value * num) / num;
}

const _toString = Object.prototype.toString