js array into object

                                    // This function counts instances of elements in an array
// the return object has the array elements as keys
// and number of occurrences as it's value
const arrToInstanceCountObj = arr => arr.reduce((obj, e) => {
  obj[e] = (obj[e] || 0) + 1;
  return obj;
}, {});

arrToInstanceCountObj(['h', 'e', 'l', 'l', 'o', 'w', 'o', 'r', 'l', 'd'])
/*
  {
    h: 1,
    e: 1,
    l: 3,
    o: 2,
    w: 1,
    r: 1,
    d: 1,
  }
*/

                                    function arrayToObject(arr) {<br/>    var obj = {};<br/>    for (var i = 0; i &lt; arr.length; ++i){<br/>        obj[i] = arr[i];<br/>    }<br/>    return obj;<br/>}<br/>var colors=[&quot;red&quot;,&quot;blue&quot;,&quot;green&quot;];<br/>var colorsObj=arrayToObject(colors);//{0: &quot;red&quot;, 1: &quot;blue&quot;, 2: &quot;green&quot;}

                                    const array =    [ [ 'cardType', 'iDEBIT' ],
      [ 'txnAmount', '17.64' ],
      [ 'txnId', '20181' ],
      [ 'txnType', 'Purchase' ],
      [ 'txnDate', '2015/08/13 21:50:04' ],
      [ 'respCode', '0' ],
      [ 'isoCode', '0' ],
      [ 'authCode', '' ],
      [ 'acquirerInvoice', '0' ],
      [ 'message', '' ],
      [ 'isComplete', 'true' ],
      [ 'isTimeout', 'false' ] ];
      
const obj = Object.fromEntries(array);
console.log(obj);