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Get the most frequent element from array of objects
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| /** | |
| * Filter an array of objects to get the most frequent element | |
| * | |
| * @param {Object[]} arr The array of objects | |
| * @param {String} keyname The name that will be used to filter the objects | |
| * @returns {Array} | |
| */ | |
| getMostFrequent(arr, keyname) { | |
| // Store how many times each element appears | |
| let lookup = {}; | |
| for (let i = 0; i < arr.length; i++) { | |
| const key = arr[i][keyname]; | |
| if (lookup[key] === undefined) lookup[key] = 0; // Insert if not available yet | |
| lookup[key]++; | |
| } | |
| // Transform that into an sortable array | |
| let sortableLookup = []; | |
| for (let o in lookup) { | |
| sortableLookup.push([o, lookup[o]]); | |
| } | |
| // Sort the elements | |
| let result = sortableLookup.sort((a, b) => b[1] - a[1]); | |
| // Get one of the most frequent | |
| let best = result[0]; | |
| // Filter by `keyname` to get the most frequent words | |
| result = result.filter(el => el[1] === best[1]).map(el => el[0]); | |
| return result; | |
| } |
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feel free to improve this code. thank you