javascript 数组查询元素及数组去重

数组查询部分

/**
 * @param {Array} src
 * @param {String} find
 * @param {String} [findByKey]
 * @return {Boolean|Number}
 */
export default function inArray(src, find, findByKey) {
  if (src.indexOf && !findByKey) {
    return src.indexOf(find);
  } else {
    let i = 0;
    while (i < src.length) {
      if ((findByKey && src[i][findByKey] == find) || (!findByKey && src[i] === find)) {// do not use === here, test fails
        return i;
      }
      i++;
    }
    return -1;
  }
}

使用

const data = [1,3,4,5,'chenjianbin',{id: 'ssd'},3,4,3,4,34,1]
console.log(inArray(data,‘chenjianbin’)) //返回 4
console.log(inArray(data,'ssd', 'id')) //返回 5

数组去重部分

/**
 * @param {Array} src [{id:1},{id:2},{id:1}]
 * @param {String} [key]
 * @param {Boolean} [sort=False]
 * @returns {Array} [{id:1},{id:2}]
 */
export default function uniqueArray(src, key, sort) {
  let results = [];
  let values = [];
  let i = 0;

  while (i < src.length) {
    let val = key ? src[i][key] : src[i];
    if (inArray(values, val) < 0) {
      results.push(src[i]);
    }
    values[i] = val;
    i++;
  }

  if (sort) {
    if (!key) {
      results = results.sort();
    } else {
      results = results.sort((a, b) => {
        return a[key] > b[key];
      });
    }
  }

  return results;
}