计算数组中每个元素出现的次数

Posted 2020-10-26 suga

var names = [‘suga‘, ‘bts‘, ‘suga‘, ‘v‘, ‘jimin‘];
var countedNames = names.reduce(function (allNames, name) {
　　if (name in allNames) {
　　　　allNames[name]++;
　　}
　　else {
　　　　allNames[name] = 1;
　　}
　　return allNames;
}, {});
console.log(countedNames);