[英]Sort an array of objects alphabetically and remove duplicates
所以我有一个objects
array
,例如:
[
{ letter: 'A', title: 'All' },{ letter: 'B', title: 'Business' },
{ letter: 'G', title: 'Cor' },
{ letter: 'G', title: 'Car' },
]
我如何对其进行排序,使其看起来像这样:
[
{ letter: 'A', title: 'All' },
{ letter: 'B', title: 'Business' },
{ letter: 'G', title: 'Cor', 'Car' },
]
这样的事情会起作用
const original = [
{ letter: 'A', title: 'All' },
{ letter: 'B', title: 'Business' },
{ letter: 'G', title: 'Cor' },
{ letter: 'G', title: 'Car' },
];
const map = {};
original.forEach(({letter, title}) => {
if(!Object.hasOwnProperty.call(map, letter)) map[letter] = {letter, title: [title]};
else {
map[letter]?.title.push(title);
}
});
console.debug(Object.values(map));
您可以使用Array.sort()
按字母对输入数组进行排序,然后使用Array.reduce()
和Map
object 按字母对输入进行分组:
const input = [ { letter: 'Z', title: 'Title Z' }, { letter: 'A', title: 'All' }, { letter: 'B', title: 'Business' }, { letter: 'G', title: 'Cor' }, { letter: 'G', title: 'Car' }, ]; const sortedInput = input.sort(({ letter: a},{ letter: b}) => a.localeCompare(b)); const result = [...sortedInput.reduce((acc, { letter, title }) => { return acc.set(letter, { letter, title: [...(acc.get(letter)?.title || []), title] } ); }, new Map()).values()]; console.log('Result:', result)
.as-console-wrapper { max-height: 100%;important: top; 0; }
您可以先sort
再filter
。
const data = [{
letter: 'A',
title: 'All'
}, {
letter: 'B',
title: 'Business'
}, {
letter: 'G',
title: 'Cor'
}, {
letter: 'A',
title: 'Car'
}];
data.sort(function (a, b) {
if (a.letter < b.letter) {
return -1;
}
if (a.letter > b.letter) {
return 1;
}
return 0;
})
const result = data.filter((v, i, a) => a.findIndex(t => (t.letter === v.letter)) === i)
console.log(result)
您可以先排序,然后减少数组。
const data = [{ letter: 'A', title: 'All' }, { letter: 'B', title: 'Business' }, { letter: 'G', title: 'Cor' }, { letter: 'G', title: 'Car' }], result = data.sort((a, b) => a.letter.localeCompare(b.letter)).reduce((r, o) => { if (r[r.length - 1]?.letter === o.letter) r[r.length - 1].title += ', ' + o.title; else r.push({...o }); return r; }, []); console.log(result);
.as-console-wrapper { max-height: 100%;important: top; 0; }
let arr = [
{ letter: "A", title: "All" },
{ letter: "G", title: "Car" },
{ letter: "B", title: "Business" },
{ letter: "G", title: "Cor" },
{ letter: "A", title: "All" },
];
arr.sort((a, b) => a.letter.localeCompare(b.letter));
var result = arr.reduce((unique, o) => {
if(!unique.some(obj => obj.letter === o.letter )) {
unique.push(o);
}
return unique;
},[]);
console.log("unique and sorted arr: ", result);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.