javascript - 小写并连接数组内容(给定常量除外)的最佳方法

Question

小写并将数组内容连接到字符串中的最佳方法是什么，除了常量不必是小写之外。

var PEOPLE = 'PEOPLE';
var arr = ['people', 'PEOPLE', 'People', 'pEOPLE', 'PeoPlE'];
var result = '';
$.each(arr, function (index, value) {
    if (value !== PEOPLE) {
        value = value.toLowerCase();
    }
    result = result + ' ' + value;
});
console.log(result); // result = 'people PEOPLE people people people';

Answer 1

使用 Array.prototype.map() 和 Array.prototype.join() 函数的简单解决方案:

var PEOPLE = 'PEOPLE', 
    arr = ['people', 'PEOPLE', 'People', 'pEOPLE', 'PeoPlE'],
    result = arr.map(function(w) {
      return w !== PEOPLE? w.toLowerCase() : w;
    }).join(' ');

console.log(result);