[英]How to get objects with a common property from an array in lodash?
你好,好撒玛利亚人,我想使用 Lodash 并找到数组中拥有最多书籍的用户。
const books = [ {id:0, name: 'Adam', title: 'xx'}, {id:1, name:'Jack', title:'yy'}, { id: 2, name: 'Adam',title:'zz' } ]
提前致谢:)
function search_book(nameKey, myArray){
for (var i=0; i < myArray.length; i++) {
if (myArray[i].book === nameKey) {
return myArray[i];
}
}
}
var array = [
{ book:"deep learning", value:"this", other: "that" },
{ book:"ml", value:"this", other: "that" }
];
var resultObject = search_book("ml", array);
console.log(resultObject)
_.filter(list, { name: 'Adam' })
var group = _.countBy(list, function(item){return item.name});
这将获得列表中作者的数量,然后您可以排序并找到最大的作者。
您可以使用 lodash 的_.flow()
生成 function :
name
属性计算对象 const { flow, countBy, toPairs, maxBy, tail, head } = _ const fn = flow( arr => countBy(arr, 'name'), // count by name toPairs, // convert to [key, value] pairs arr => maxBy(arr, tail), // find the max by the value (tail) head // get the key (head) ) const books = [ {id:0, name: 'Adam', title: 'xx'}, {id:1, name:'Jack', title:'yy'}, { id: 2, name: 'Adam',title:'zz' } ] const result = fn(books) console.log(result)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.js"></script>
和使用Lodash/fp的相同想法:
const { flow, countBy, toPairs, maxBy, tail, head } = _ const fn = flow( countBy('name'), // count by name toPairs, // convert to [key, value] pairs maxBy(tail), // find the max by the value (tail) head // get the key (head) ) const books = [ {id:0, name: 'Adam', title: 'xx'}, {id:1, name:'Jack', title:'yy'}, { id: 2, name: 'Adam',title:'zz' } ] const result = fn(books) console.log(result)
<script src='https://cdn.jsdelivr.net/g/lodash@4(lodash.min.js+lodash.fp.min.js)'></script>
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