fenzhi-utils/globalMethods/CustomArray/CustomArraySumField.js

分值前端项目的js函数库

/**
 * 数组求和(根据某个字段求和)
 * @param {array} arr 求和的数组
 * @returns {number}
 */
/**
let arr_1 = [{ a: 1 }, { a: 2 }, { a: 3 }, { a: 4 }, { a: 5 }];
CustomArraySumField(arr_1, 'a'); // 15

let arr_2 = [
  { a: 1 },
  { a: null },
  { a: '' },
  { a: '1' },
  { a: undefined },
  { a: Infinity },
];
CustomArraySumField(arr_2,'a');// 2
 */
export function CustomArraySumField(arr = [], field) {
  if (!arr.length) return 0;
  if ([0, 1].includes(arguments.length)) return 0;

  return arr.reduce((pre, item) => {
    let curNum = 0;
    if (
      [null, 'null', '', 'undefined', undefined, Infinity].includes(item[field])
    )
      curNum = 0;
    else if (typeof item[field] === 'number') curNum = item[field];
    else if (typeof item[field] === 'string')
      curNum = parseInt(item[field], 10);
    else if (typeof item[field] === 'boolean') curNum = item[field] ? 1 : 0;
    return pre + curNum;
  }, 0);
}