我正在编写一个脚本来创建一个名为 dict 的字典,其中我存储了文本区域中某些单词的频率。我的数组看起来像这样:
var dict = removeArray.reduce(function(p,c) {
if (p[c] === undefined) {
p[c] = 1;
} else {
p[c]++;
}
return p;
}, {});
我想根据它们的值过滤这个字典的元素。我需要创建一个列表,其中包含值大于1的单词。我的字典看起来像这样:
{
"92173": 6,
"C": 6,
"GJHGWO.NAYE": 1,
"GJHGX4.NAYE": 1,
"GJHGX6.NAYE": 1,
"GJHGX8.NAYE": 1,
"GJHGXA.NAYE": 1,
"GJHGXC.NAYE": 1,
"RBD": 10,
"RBD3": 2,
"SAMBORNSiPOSSSTHRa": 2,
"SAMBORNSiPOSSSTHRa1": 2,
"SAMBORNSiPOSSSTHRa2": 2,
"X": 4,
"X3": 2
}
为了实现我尝试使用lodash,如下:
var filtered = _.find(dict, function(user) {
return user.frecuency > 1;
});
但是自从我失败后我失败了:
undefined
我不知道如何恰当地使用lodash来过滤这个数组。
我的完整代码如下所示:
var splitWords = document.getElementById("texto").value.split(/[["\|~]/);
var removeArray = _.remove(splitWords, function (word) {
return word !== '' && word !== ' ' && word !== '\n'
});
var dict = removeArray.reduce(function(p,c) {
if (p[c] === undefined) {
p[c] = 1;
} else {
p[c]++;
}
return p;
}, {});
console.log(dict);
var filtered = _.find(dict, function(user) {
return user.frecuency > 1;
});
console.log(filtered)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>
<p id="demo"></p>
<textarea cols="150" rows="15" id="texto">
"RBD|X|RBD3|C|92173~GJHGWO.NAYE"
"SAMBORNSiPOSSSTHRa1"
"RBD|X|RBD|C|92173~GJHGX4.NAYE"
"SAMBORNSiPOSSSTHRa"
"RBD|X3|RBD3|C|92173~GJHGX6.NAYE"
"SAMBORNSiPOSSSTHRa1"
"RBD|X|RBD|C|92173~GJHGX8.NAYE"
"SAMBORNSiPOSSSTHRa2"
"RBD|X|RBD|C|92173~GJHGXA.NAYE"
"SAMBORNSiPOSSSTHRa2"
"RBD|X3|RBD|C|92173~GJHGXC.NAYE"
"SAMBORNSiPOSSSTHRa"
</textarea>
&#13;
答案 0 :(得分:18)
您可以再次使用reduce
来实现纯JavaScript:
var filtered = Object.keys(dict).reduce(function (filtered, key) {
if (dict[key] > 1) filtered[key] = dict[key];
return filtered;
}, {});
使用一些ES6功能,例如箭头功能,扩展语法,Object.entries
,......它可能如下所示:
var filtered = Object.assign({}, ...
Object.entries(dict).filter(([k,v]) => v>1).map(([k,v]) => ({[k]:v}))
);
或使用较新的Object.fromEntries
:
var filtered = Object.fromEntries(Object.entries(dict).filter(([k,v]) => v>1));
您尝试使用lodash时遇到了一些问题:
_.find
不用于返回从给定对象中选择键/值的对象。你需要_.pickBy
。frecuency
属性;它们是原始值,因此您只需返回user > 1
Lodash代码:
var filtered = _.pickBy(dict, function(user) {
return user > 1;
});