js map filter reduce

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Carsten
05 Feb 2020
1Map, Filter, Reduce javascript
2//=================================
3let myarray = [
4  {
5    name: "John",
6    city: "london",
7    dept: "computer",
8    salary: 1000,
9  },
10  {
11    name: "bella",
12    city: "new york",
13    dept: "fianance",
14    salary: 1000,
15  },
16  {
17    name: "justine",
18    city: "paris",
19    dept: "computer",
20    salary: 1000,
21  },
22];
23console.log("myarray : ", myarray);
24// ----------------------------------
25// map
26let mapArray = myarray.map(function (item) {
27  return item.name;
28});
29console.log("mapArray : ", mapArray);
30// ----------------------------------
31//filter
32let filterArray = myarray.filter(function (item) {
33  if (item.dept == "computer") {
34    return true;
35  } else {
36    return false;
37  }
38});
39console.log("filterArray : ", filterArray);
40// ----------------------------------
41//reduce
42// 1.
43let reduceArray1 = myarray.reduce(function (acc, item) {
44  return acc + item.salary;
45}, 0);
46console.log("reduceArray1 : ", reduceArray1);
47// ------
48// 2.
49let reduceArray2 = myarray.reduce(
50  function (acc, item) {
51    if (item.dept == "computer") {
52      acc.com.push(item.name);
53    } else {
54      acc.finance.push(item.name);
55    }
56    return acc;
57  },
58  { com: [], finance: [] }
59);
60console.log("reduceArray2 : ", reduceArray2);
61// ----------------------------------
source
Simona
30 May 2018
1const numbers = [1, 2, 3, 4];
2const sum = numbers.reduce(function (result, item) {
3  return result + item;
4}, 0);
5console.log(sum); // 10
source
Nahel
19 Jun 2019
1const students = [
2  { name: 'Quincy', grade: 96 },
3  { name: 'Jason', grade: 84 },
4  { name: 'Alexis', grade: 100 },
5  { name: 'Sam', grade: 65 },
6  { name: 'Katie', grade: 90 }
7];
8
9const studentGrades = students.filter(student => student.grade >= 90);
10return studentGrades; // [ { name: 'Quincy', grade: 96 }, { name: 'Alexis', grade: 100 }, { name: 'Katie', grade: 90 } ]
source
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