@feizheng/next-sum v1.0.0

next-sum

Gets the sum of the values in collection.

installation

npm install -S @feizheng/next-sum

usage

import '@feizheng/next-sum';

const arr1 = [1, 2, 3, 4, 5];
const arr2 = [
  { key: '1', value: 111 },
  { key: '2', value: 222 },
  { key: '3', value: 333 },
  { key: '4', value: 444 }
];
const arr3 = [
  { key: 1, value: 111 },
  { key: 2, value: null },
  { key: 3, value: 2 },
  { key: 3, value: 'abc555' }
];

// simple
nx.sum(arr1);   // 15
nx.sum(arr2, 'value'); // 1110

// with callback
nx.sum(arr3, function (_, item) {
  var val = parseInt(item.value, 10);
  return val ? val : 0;
});

// 113

license

Code released under the MIT license.