convert array to object in javascript

1const names = ['Alex', 'Bob', 'Johny', 'Atta'];
2
3// convert array to th object
4const obj = Object.assign({}, names);
5
6// print object
7console.log(obj);
8
9// {0: "Alex", 1: "Bob", 2: "Johny", 3: "Atta"}
10

1const convertArrayToObject = (array, key) =>
2  array.reduce(
3    (obj, item) => ({
4      ...obj,
5      [item[key]]: item
6    }),
7    {}
8  );
9

1const array =    [ [ 'cardType', 'iDEBIT' ],
2      [ 'txnAmount', '17.64' ],
3      [ 'txnId', '20181' ],
4      [ 'txnType', 'Purchase' ],
5      [ 'txnDate', '2015/08/13 21:50:04' ],
6      [ 'respCode', '0' ],
7      [ 'isoCode', '0' ],
8      [ 'authCode', '' ],
9      [ 'acquirerInvoice', '0' ],
10      [ 'message', '' ],
11      [ 'isComplete', 'true' ],
12      [ 'isTimeout', 'false' ] ];
13      
14const obj = Object.fromEntries(array);
15console.log(obj);

1function arrayToObject(arr) {
2    var obj = {};
3    for (var i = 0; i < arr.length; ++i){
4        obj[i] = arr[i];
5    }
6    return obj;
7}
8var colors=["red","blue","green"];
9var colorsObj=arrayToObject(colors);//{0: "red", 1: "blue", 2: "green"}

1// This function counts instances of elements in an array
2// the return object has the array elements as keys
3// and number of occurrences as it's value
4const arrToInstanceCountObj = arr => arr.reduce((obj, e) => {
5  obj[e] = (obj[e] || 0) + 1;
6  return obj;
7}, {});
8
9arrToInstanceCountObj(['h', 'e', 'l', 'l', 'o', 'w', 'o', 'r', 'l', 'd'])
10/*
11  {
12    h: 1,
13    e: 1,
14    l: 3,
15    o: 2,
16    w: 1,
17    r: 1,
18    d: 1,
19  }
20*/

1const names = ['Alex', 'Bob', 'Johny', 'Atta'];
2
3const obj = Object.assign({}, names);