Step by Step solution about How to resolve the algorithm Hash from two arrays step by step in the JavaScript programming language

The code you provided demonstrates three different ways to convert two arrays, keys and values, into a single JavaScript object, map. Each method is explained below:

1. Using a for loop:

   • This method explicitly loops through both keys and values arrays, assigning each corresponding key-value pair to the map object.

2. Using the forEach() array method:

   • The forEach() method iterates over the keys array, calling a callback function for each element. Within the callback function, the current key and its corresponding value from the values array are assigned to the map object.

3. Using the reduce() array method:

   • The reduce() method iterates over the keys array, accumulating a single output value (in this case, the map object). The callback function takes the current map, the current key, and its corresponding index in the values array. It then adds the key-value pair to the map and returns the updated map object.

All three methods ultimately produce the same result: An object map where the keys are taken from the keys array, and the values are taken from the values array. The desired method depends on the specific requirements of your application and the ease of implementation in your particular project.

var keys = ['a', 'b', 'c'];
var values = [1, 2, 3];
var map = {};
for(var i = 0; i < keys.length; i += 1) {
  map[ keys[i] ] = values[i];
}


function arrToObj(keys, vals) {
  var map = {};
  keys.forEach(function (key, index) {
    map[key] = val[index];
  });
  return map;
}


function arrToObj(keys, vals) {
  return keys.reduce(function(map, key, index) {
    map[key] = vals[index];
    return map;
  }, {});
}