javascript Lodash 在数组中按开始搜索
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Lodash search by startswith in an array
提问by Joey Hipolito
I'm creating a simple search that searches an array of objects that starts with a string passed from an input.
我正在创建一个简单的搜索，它搜索以从输入传递的字符串开头的对象数组。
So I have this:
所以我有这个：
var items = [
{id: 1, tags: ['foo']},
{id: 2, tags: ['fish', 'ball']},
{id: 3, tags: ['bar', 'goo']},
];
input.on(function(e) {
var test = _.filter(items, function(item) {
return _.includes(_.pluck(items, 'tags'), input.val());
});
console.log(test);
});
This always returns an empty array, I think i'm missing startsWith, how do I use it here in my implementation:
这总是返回一个空数组，我想我错过了startsWith，我如何在我的实现中使用它：
The expected output should be:
预期的输出应该是：
input: 'f'
output: [{id: 1, tags: ['foo']}, {id: 2, tags: ['fish', 'ball']}]
since the two items have tags that starts with f
因为这两个项目的标签以 f
回答by Alex Netkachov
Basically, you do not need lodash for that:
基本上，您不需要 lodash：
var test = items.filter(function (item) {
return item.tags.some(function (tag) {
return 0 === tag.indexOf(input.val());
});
});
But if you like, you can use it
但是如果你喜欢，你可以使用它
var test = _.filter(items, function (item) {
return _.some(item.tags, function (tag) {
return _.startsWith(tag, input.val());
});
});
回答by num8er
Try this:
试试这个：
$(function(){
var items = [
{id: 1, tags: ['foo']},
{id: 2, tags: ['fish', 'ball']},
{id: 3, tags: ['bar', 'goo']},
];
var input = $('input:first');
input.on('input', function(e) {
var test = _.filter(items, function(item) {
for(var t in item.tags) {
if(item.tags[t].indexOf(input.val())==0) {
return true;
}
}
return false;
});
console.log(test);
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://raw.githubusercontent.com/lodash/lodash/3.10.0/lodash.min.js"></script>
<input>回答by dynamitereed
Try this:
试试这个：
var items = [
{id: 1, tags: ['foo']},
{id: 2, tags: ['fish', 'ball']},
{id: 3, tags: ['bar', 'goo']}
];
input.on(function(e) {
var test = _.filter(items, function(item) {
return _.chain(items.tags)
.map(_.partial(_.startsWith, _, input.val()))
.any()
.value();
});
console.log(test);
});
