How Can I Group Objects in an Array Based on a Common Property?

Group Objects by a Common Property

Problem:

You have an array of objects where each object has a "group" property. You want to transform this array into a new array where similar "group" property values are grouped together.

Desired Output:

myArray = [
  {group: "one", color: ["red", "green", "black"]},
  {group: "two", color: ["blue"]}
]

Solution:

1. Create a mapping of group names to empty arrays:

var group_to_values = {};

2. Iterate over the input array:

myArray.forEach(function (item) {
    group_to_values[item.group] = group_to_values[item.group] || [];
});

3. For each key in the mapping, create an object with the group name and an array of values:

var groups = [];
for (var key in group_to_values) {
    groups.push({group: key, color: group_to_values[key]})
}

4. The resulting groups array will be grouped by the "group" property.

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