我有一组对象-像这样:
[
{"name" : "blar", "percentageTotal" : "10", "mostPopular" : "false", "leastPopular" : "false"},
{"name" : "foo", "percentageTotal" : "40", "mostPopular" : "false", "leastPopular" : "false"},
{"name" : "bar", "percentageTotal" : "50", "mostPopular" : "false", "leastPopular" : "false"}
]
基于“ percentageTotal”属性,迭代对象并更新“ mostPopular”和“ leastPopular”属性的最佳方法是什么?
最佳答案
一次通过最大/最小“ percentageTotal”找到最受欢迎和最不受欢迎商品的索引,将最受欢迎/最不受欢迎的属性设置为false,然后从存储的索引中设置最受欢迎/最不受欢迎的项目。
function updatePopularity(items) {
// Find the min/max popularity by percentage total.
var min=null, max=null, i;
for (i=0; i<items.length; i++) {
items[i].mostPopular = items[i].leastPopular = false;
if (!max || (items[i].percentageTotal > max.pct)) {
max = {idx:i, pct:items[i].percentageTotal};
}
if (!min || (items[i].percentageTotal < min.pct)) {
min = {idx:i, pct:items[i].percentageTotal};
}
}
// Set the most/least popular values.
items[max[idx]].mostPopular = true;
items[min[idx]].leastPopular = true;
}
此解决方案不需要名称唯一。通过设置
it=items[i]
并改用它,可能会获得较小的性能提升。关于javascript - 计算出一系列对象中最受欢迎和最不受欢迎的对象,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/5470153/