[removed] How group and sum values from multidimensional array

Question

I have an array like this:

I would like to group and get the sum of each repetition like this:

• AGE270: 9
• AGE203: 5
• AGE208: 9

Answer 1

Using lodash:

var data; // the data represented by your screenshot

var counts = _.chain(data)
    .groupBy('AGENDADOR')
    .map(_.size)
    .value();

counts will now be an object like this:

{
    "AGE270": 9,
    "AGE203": 5,
    // etc
}