找到阵列的模式？使用Javascript [英] Finding the mode's of an array? Javascript

问题描述

好的，我只想出了如何从数组中获得一种模式..
但是如果它们出现相同的次数，我想获得2,3或更多。
这是代码：

Okay, I've only figured out how to get one mode out of the array.. But I want to get 2, 3 or more if they occur the same amount of times. This is the code:

var frequency = {};  // array of frequency.
var maxFreq = 0;  // holds the max frequency.

for (var i in array) {
    frequency[array[i]] = (frequency[array[i]] || 0) + 1; // increment frequency.

    if (frequency[array[i]] > maxFreq) { // is this frequency > max so far ?
        maxFreq = frequency[array[i]];  // update max.
        mode = array[i];          // update result.
    }
}

所以现在，如果我有一个 array = [3,8,3,6,1,2,9];
我得到 mode = 3;

So right now, if I've got a array = [3, 8, 3, 6, 1, 2, 9]; I get mode = 3;

但我正在寻找的是if array = [3,6,1,9,2,3,6， 6,3,1，-8,7];
我想得到 mode = 3,6;

But what I'm looking for is if array = [3, 6, 1, 9, 2, 3, 6, 6, 3, 1, -8, 7]; I want to get the mode = 3, 6;

推荐答案

问题没有说明如何获取模式，但如果我们想要它们在数组中，我们可以像这样更改代码：

The question doesn't state how to get the modes, but if we want them in an array, we could change the code like this:

function getModes(array) {
  var frequency = {}; // array of frequency.
  var maxFreq = 0; // holds the max frequency.
  var modes = [];

  for (var i in array) {
    frequency[array[i]] = (frequency[array[i]] || 0) + 1; // increment frequency.

    if (frequency[array[i]] > maxFreq) { // is this frequency > max so far ?
      maxFreq = frequency[array[i]]; // update max.
    }
  }

  for (var k in frequency) {
    if (frequency[k] == maxFreq) {
      modes.push(k);
    }
  }

  return modes;
}

alert(getModes([3, 6, 1, 9, 2, 3, 6, 6, 3, 1, -8, 7]));

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