First off, apologies if this is normally a simple thing, but I'm not particularly experienced in JS. I'm trying to make some graphs in Plotly.js for a work site that currently holds raw JSON. We have a JSON in the format:

```
stuff = [{"name": "shark", "location": "somewhere", "number":10},
         {"name": "shark", "location": "somewhereelse", "number":50},
         {"name": "shark", "location": "somewhere", "number":25},
         {"name": "turtle", "location": "anotherplace", "number":1},
         {"name": "elephant", "location": "greatplace", "number":50},
         {"name": "elephant", "location": "greatplace", "number":75}

```

And I need the result to look like:

```
computed = [{"name":"shark", "location":"somewhere", "number":35},
            {"name":"shark", "location":"somewhereelse", "number":50},
            {"name":"turtle", "location":"anotherplace", "number":1},
            {"name":"elephant", "location":"greatplace", "number":125}

```

Where all names are grouped by location and all numbers in that group are summed. It is then this computed JSON that I'll be using to graph with Plotly.js with some functions I have already built.

I think I can simplify the problem as:

```
forEach((item) => {
x.push(item['location']
y.push(y += stuff.number where stuff.location === x[-1])
}

```

But this also means I'll get the same number of rows as in stuff, just computed and graphed. I'm afraid I can't figure it out any further.

Any help would be muchly appreciated.