Hello guys I have a task on sort. Here is the deal: I have an array
arr = [{role:'mom', name:'a'}, {role:'dad', name:'d'}, {role:'bro', name: 'c'}]
and sort sequence list sortSequence = ['dad','mom','bro']
so according this list I need an output array to be equal
arr = [{role:'dad', name:'d'}, {role:'mom', name:'a'}, {role:'bro', name: 'c'}]
How can use sort method to do this?
const sortAccordingList = (list, arr) => {
//... ?
}
You can use indexOf to get the index of the role
var sortSequence = ['dad', 'mom', 'bro'];
var arr = [{role:'mom', name:'a'}, {role:'dad', name:'d'}, {role:'bro', name: 'c'}];
arr.sort((a, b) => sortSequence.indexOf(a.role) - sortSequence.indexOf(b.role));
console.log(arr);You can also make sortSequence as an object. This will make it easier to get the sort sequence. Like:
var sortSequence = {dad:1,mom:2,bro:3};
var arr = [{role:'mom', name:'a'}, {role:'dad', name:'d'}, {role:'bro', name: 'c'}];
arr.sort((a, b) => sortSequence[a.role] - sortSequence[b.role]);
console.log(arr);
let s = sortSequence.reduce((p, c, i) => (p[c] = i, p), {}); arr.sort(({role: a}, {role: b}) => s[a] - s[b]);