Question

72

Finding Mode in Javascript

rated 0 times [ 75] [ 3] / answers: 1 / hits: 5405 / 10 Years ago, sat, september 27, 2014, 12:00:00

I am having a difficult time with my code. I am working on a coderbyte problem and one part of the challenge is to find the mode of an array of numbers. So my first step I think is to create an object with numbers and their frequency. Here's what I have so far:

arr = [1,1,1,6,2,3,4];

mapping = {};

counter = 0

for(var i = 0;i < arr.length; i++){

    mapping[arr[i]] = 0;

       if(arr[i] == mapping[i.toString])

            mapping[i.toString] += 1

}

mapping

but this is giving me { '1': 0, '2': 0, '3': 0, '4': 0, '6': 0 }

Any ideas?

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bradley

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4 Years ago

answered 10 Years ago lucianod · Accepted Answer

This works better:

arr = [1,1,1,6,2,3,4];

mapping = {};

counter = 0

for(var i = 0;i < arr.length; i++){

    if (!mapping[arr[i]]) mapping[arr[i]] = 0;

    mapping[arr[i]] += 1

}



// mapping = {1: 3, 2:1, 3:1, 4:1, 6:1}