vue2-filter-list/collection/filter-by.js

Prebuilt Vue.js filters

import util from '../util/index'

/**
 * Filter filter for arrays
 *
 * @param {Array} arr
 * @param {String} prop
 * @param {String|Number} search
 */

function filterBy (arr, search) {
  var arr = util.convertArray(arr)
  if (search == null) {
    return arr
  }
  if (typeof search === 'function') {
    return arr.filter(search)
  }
  // cast to lowercase string
  search = ('' + search).toLowerCase()
  var n = 2
  // extract and flatten keys
  var keys = Array.prototype.concat.apply([], util.toArray(arguments, n))
  var res = []
  var item, key, val, j
  for (var i = 0, l = arr.length; i < l; i++) {
    item = arr[i]
    val = (item && item.$value) || item
    j = keys.length
    if (j) {
      while (j--) {
        key = keys[j]
        if ((key === '$key' && contains(item.$key, search)) ||
            contains(util.getPath(val, key), search)) {
          res.push(item)
          break
        }
      }
    } else if (contains(item, search)) {
      res.push(item)
    }
  }
  return res
}

function contains (val, search) {
  var i
  if (util.isPlainObject(val)) {
    var keys = Object.keys(val)
    i = keys.length
    while (i--) {
      if (contains(val[keys[i]], search)) {
        return true
      }
    }
  } else if (util.isArray(val)) {
    i = val.length
    while (i--) {
      if (contains(val[i], search)) {
        return true
      }
    }
  } else if (val != null) {
    return val.toString().toLowerCase().indexOf(search) > -1
  }
}

export default filterBy