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| 1 | +function meanMedianMode(arr) { |
| 2 | + return { |
| 3 | + mean: getMean(arr), |
| 4 | + median: getMedian(arr), |
| 5 | + mode: getMode(arr) |
| 6 | + }; |
| 7 | +} |
| 8 | + |
| 9 | +function getMean(arr) { |
| 10 | + let sum = 0; |
| 11 | + |
| 12 | + arr.forEach(num => { |
| 13 | + sum += num; |
| 14 | + }); |
| 15 | + |
| 16 | + let mean = sum / arr.length; |
| 17 | + return mean; |
| 18 | +} |
| 19 | + |
| 20 | +function getMedian(arr) { |
| 21 | + arr.sort(function(a, b) { |
| 22 | + return a - b; |
| 23 | + }); |
| 24 | + let median; |
| 25 | + |
| 26 | + if (arr.length % 2 !== 0) { |
| 27 | + median = arr[Math.floor(arr.length / 2)]; |
| 28 | + } else { |
| 29 | + let mid1 = arr[arr.length / 2 - 1]; |
| 30 | + let mid2 = arr[arr.length / 2]; |
| 31 | + median = (mid1 + mid2) / 2; |
| 32 | + } |
| 33 | + |
| 34 | + return median; |
| 35 | +} |
| 36 | + |
| 37 | +function getMode(arr) { |
| 38 | + let modeObj = {}; |
| 39 | + |
| 40 | + arr.forEach(num => { |
| 41 | + if (!modeObj[num]) modeObj[num] = 0; |
| 42 | + modeObj[num]++; |
| 43 | + }); |
| 44 | + |
| 45 | + let maxFrequency = 0; |
| 46 | + let modes = []; |
| 47 | + for (let num in modeObj) { |
| 48 | + if (modeObj[num] > maxFrequency) { |
| 49 | + modes = [num]; |
| 50 | + maxFrequency = modeObj[num]; |
| 51 | + } else if (modeObj[num] === maxFrequency) modes.push(num); |
| 52 | + } |
| 53 | + |
| 54 | + if (modes.length === Object.keys(modeObj).length) modes = []; |
| 55 | + |
| 56 | + return modes; |
| 57 | +} |
| 58 | + |
| 59 | +meanMedianMode([1, 2, 3, 4, 5, 4, 6, 1]); // { mean: 3.25, median: 3.5, mode: [ '1', '4' ] } |
| 60 | + |
| 61 | +meanMedianMode([9, 10, 23, 10, 23, 9]); // mean: 14, median: 10, mode: [] } |
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