javascript - 在数组中查找对象

Question

我想用 underscore.js 实现某种 hasObject 函数。

示例:

var Collection = {
    this.items: [];
    this.hasItem: function(item) {
        return _.find(this.items, function(existingItem) { //returns undefined
            return item % item.name == existingItem.name;
        });
    }
};

Collection.items.push({ name: "dev.pus", account: "stackoverflow" });
Collection.items.push({ name: "margarett", account: "facebook" });
Collection.items.push({ name: "george", account: "google" });

Collection.hasItem({ name: "dev.pus", account: "stackoverflow" }); // I know that the name would already be enough...

出于某种原因，下划线 find 返回未定义...

我做错了什么？

Answer 1

看起来您正在过于字面地阅读下划线文档，其中他们有:

var even = _.find([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });

但是，这对您的情况没有任何意义，您只想查看 .name 属性是否等于其他一些对象的 .name，如下所示:

var Collection = {
    items: [],

    hasItem: function(item) {
        return _.find(this.items, function(existingItem) { //returns undefined
            return item.name === existingItem.name;
        });
    }
};