考虑以下数组:
[
{url: 'https://url.com/file1', md5: 'fbbbabcc19264ce7b376ce4c726b9b85'},
{url: 'https://url.com/file2', md5: 'd920d140432b961f07695ec34bd2a8ad'},
{url: 'https://url.com/file3', md5: 'fbbbabcc19264ce7b376ce4c726b9b85'},
{url: 'https://url.com/file4', md5: 'bf80655dbe90123324f88a778efa39f7'},
{url: 'https://url.com/file5', md5: 'fbbbabcc19264ce7b376ce4c726b9b85'}
]
文件“ file1”,“ file3”和“ file5”具有相同的内容,因此具有相同的md5。我只想保留具有不同md5(文件1,文件2,文件4)的文件。
使用现代ES6有哪些可能的方法来实现此目的?
const arr = [
{url: 'https://url.com/file1', md5: 'fbbbabcc19264ce7b376ce4c726b9b85'},
{url: 'https://url.com/file2', md5: 'd920d140432b961f07695ec34bd2a8ad'},
{url: 'https://url.com/file3', md5: 'fbbbabcc19264ce7b376ce4c726b9b85'},
{url: 'https://url.com/file4', md5: 'bf80655dbe90123324f88a778efa39f7'},
{url: 'https://url.com/file5', md5: 'fbbbabcc19264ce7b376ce4c726b9b85'}
];
const removeDuplicates = (myArr, prop) => {
return myArr.filter((obj, pos, arr) => {
return arr.map(mapObj => mapObj[prop]).indexOf(obj[prop]) === pos;
});
}
const result = removeDuplicates(arr, 'md5');
console.log(result)
您可以通过特定键过滤数组,在您的情况下为'md5'。
您可以使用Set来跟踪已找到的文件。
const arr = [{
url: 'https://url.com/file1',
md5: 'fbbbabcc19264ce7b376ce4c726b9b85'
},
{
url: 'https://url.com/file2',
md5: 'd920d140432b961f07695ec34bd2a8ad'
},
{
url: 'https://url.com/file3',
md5: 'fbbbabcc19264ce7b376ce4c726b9b85'
},
{
url: 'https://url.com/file4',
md5: 'bf80655dbe90123324f88a778efa39f7'
},
{
url: 'https://url.com/file5',
md5: 'fbbbabcc19264ce7b376ce4c726b9b85'
}
]
const uniqueFiles = new Set();
const ans = arr.filter(ele => {
if (!uniqueFiles.has(ele.md5)) {
uniqueFiles.add(ele.md5);
return true;
}
return false;
});
console.log(ans)