使用lodash在其他数组内的数组中查找值 [英] Find a value in an array inside other array with lodash

问题描述

我有一个数组，例如:

var db = [{
        "words": ["word1a", "word1b", "word1c"],
        "answer": "answer1"
    }, {
        "words": ["word2a", "words2b"],
        "answer": "answer2"
    }]

我在node.js上使用lodash来检查数组中的值.我想搜索单词并返回响应.例如，如果我搜索"word1a"，则响应为"answer1"

I'm using lodash on node.js to check values in an array. I want to search words and return an response. For example, if I search "word1a", the response is "answer1"

我尝试:

var e = _.find(db, function(o){
    o.words === "say"
});
console.log(e);

但是我找不到结果；

很显然，我不确定，因为我正在比较一个确切的值.我如何获得价值?

Obviously, I get undefined because I'm comparing an exactly value. How can I get the value?

推荐答案

好吧，您也得到了undefined，因为您也没有返回o.words === "say"比较.

Well, you're also getting undefined because you also aren't returning the o.words === "say" comparison.

但是你是对的，这种比较在这种情况下是行不通的.您应该在_.find回调中使用类似_.some的内容:

But you're right, that comparison wouldn't work in this case. You should use something like _.some inside the _.find callback:

var e = _.find(db, function(o) {
    return _.some(o.words, function(word) {
        return word === 'say';
    });
});

这应该给您对象(如果未找到，则为未定义).如果要专门使用answer，则仍然必须将其从对象中拉出.

This should give you the object back (or undefined, if none are found). If you want answer specifically, you'll still have to pull it out of the object.

这是工作小提琴.请注意，您还应该对undefined对象/属性进行一些额外的保护.不过，我将由您决定.

Here's a working fiddle. Note that you should also put in some extra protection against undefined objects / properties. I'll leave that up to you, though.

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