javascript - 如何查找 Javascript 数组中最高元素的出现次数？

Question

function findMaxOccurence(ar){    
        ar.sort().reverse() // Reverses a sorted array Max to min 
        count = 0;
        for(i=0;i<ar.length;i++){
            ++count
            if(i == ar.length - 1){//break out when last element reached
                break
            }
            if(ar[i+1] != ar[i]){
                break
            }
        }
    return count
}

如何查找 Javascript 数组中最高元素的出现次数？

Answer 1

您可以使用reduce 方法来编写更简单的解决方案。

The reduce() method applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value.

let dataset = [2,8,4,8,6,4,7,8];
let max= Math.max(...dataset);
var count = dataset.reduce(function(counter, value) {
    return counter + (value === max);
}, 0);
console.log(count);

此外，您可以通过传递一个回调函数来使用filter方法。

let count = dataset.filter(x => x === max).length;