mode

Given a list of items, recall that the mode of the list is the item that occurs most often. I would like to know how to create a function that can find the mode of a list but that displays a message if the list does not have a mode (e.g., all the items in the list only appear once). I want to make this function without importing any functions. I'm trying to make my own function from scratch. David Dao You can use the max function and a key. Have a look at python max function using 'key' and lambda expression . max(set(list), key=list.count) Christian Witts You can use the Counter supplied in

I'm looking for an elegant way of determining which element has the highest occurrence ( mode ) in a JavaScript array. For example, in ['pear', 'apple', 'orange', 'apple'] the 'apple' element is the most frequent one. This is just the mode. Here's a quick, non-optimized solution. It should be O(n). function mode(array) { if(array.length == 0) return null; var modeMap = {}; var maxEl = array[0], maxCount = 1; for(var i = 0; i < array.length; i++) { var el = array[i]; if(modeMap[el] == null) modeMap[el] = 1; else modeMap[el]++; if(modeMap[el] > maxCount) { maxEl = el; maxCount = modeMap[el]; } }