Using an if statement in conjunction with creating a mapped variable (Javascript)

Question

I'm trying to create a suite of histograms for a website. I want to created a mapped variable that only pulls out the speed data if the character has a specific rank. My data set looks like the following (I've bolded the relevant variables that I want to deal with):

myData = [{name:'Maru', rank:'L', speed:117.6},{name:'Kharg', rank:'G', speed:114.4}...and so on...]

I'm trying to use an if statement (pseudocode: if myData.rank = 'L'...) in conjunction with the following:

var speedData = myData.map(function(i){ return i.speed; })

However, I'm not having any luck. Here's a sample of what I'm trying (among other things, but I suspect that this is the closest to working):

    var lightData = myData.map(function(i){
        if (i.rank == 'L'){
            return i.speed;}
            })

Is this possible using just js and D3? I suspect that something like Django might make this easier, but it's an assignment that limits to just js and D3.

I realize that if my data set was smaller, I could manually separate all the ranks and then do a merge when I need to run all the data at once. However, that's just not practical with the data I have.

Nina Scholz · Accepted Answer · 2017-06-21 06:53:59Z

1

With plain Javascript, you could use a chained approach by filtering first and then map the value, you need.

var result = myData
        .filter(function (o) { return o.rank === 'L'; })
        .map(function (o) { return o.speed; });

answered Jun 21, 2017 at 6:53

Nina Scholz

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