eligendiodit/src/uniq.js

A powerful javascript functions library!

var UDF = undefined;
var isUdf = require('./isUdf');
var isBol = require('./isBol');
var typeVal = require('./typeVal');
var get = require('./get');
var isDeepEqual = require('./isDeepEqual');

/**@function*/

/**
 * [fn.uniq] 去重或根据字段去重
 * @param srcArr  : array
 * @param pathStr : string [?]
 * @param isDeep  : boolean = true
 */
function uniq(srcArr, pathStr, isDeep) {
  if (isUdf(isDeep)) isDeep = true;
  if (isBol(pathStr)) isDeep = pathStr, pathStr = UDF;
  pathStr = typeVal(pathStr, 'str');
  var tmpArr = srcArr.slice(), i = -1;
  while (++i < tmpArr.length - 1) {
    for (var j = i + 1; j < tmpArr.length; j++) {
      var isDuplicate;
      if (pathStr) {
        var val1 = get(tmpArr[i], pathStr), val2 = get(tmpArr[j], pathStr);
        isDuplicate = isDeep ? isDeepEqual(val1, val2) : val1 === val2;
      } else {
        isDuplicate = isDeep ? isDeepEqual(tmpArr[i], tmpArr[j]) : tmpArr[i] === tmpArr[j];
      }
      if (isDuplicate) tmpArr.splice(j--, 1);
    }
  }
  return tmpArr;
}

/**@function*/
module.exports = uniq;