Sorting arrays inside an array [duplicate]

Question

I need to sort some arrays inside an array.

For example:

let mainArr = [['john', 27, 'teacher'], ['Mary', 17, 'student'], ['Jane', 40, 'police']];

In this case I want to sort it by person's age, so the output would be:

let mainArrSorted = [['Mary', 17, 'student'], ['john', 27, 'teacher'], ['Jane', 40, 'police']];

Any sugestions?

NOTE: I don't want to implement array.sort() method.

Thank you in advance.

looks like you are sorting by the age(assuming that is what number is in each sub array) of each array. you could sort by [i][1] ? — Josh Adams
– Josh Adams, Commented Nov 5, 2018 at 22:18
you could sort it as you would sort an array with single items. — Nina Scholz
– Nina Scholz, Commented Nov 5, 2018 at 22:18
You would sort it like you would sort an array of any objects, by their [1] property. — Bergi
– Bergi, Commented Nov 5, 2018 at 22:21

protoproto · Accepted Answer · 2018-11-05 22:48:40Z

0

You can use array sort function:

let mainArr = [['john', 27, 'teacher'], ['Mary', 17, 'student'], ['Jane', 40, 'police']];
let mainArrSorted = mainArr.sort((a,b)=>(a[1]-b[1]));
console.log(mainArrSorted);
// mainArrSorted = [['Mary', 17, 'student'], ['john', 27, 'teacher'], ['Jane', 40, 'police']];

To prevent the source array will be sorted follow the destination array, you can use this code:

let mainArr = [['john', 27, 'teacher'], ['Mary', 17, 'student'], ['Jane', 40, 'police']];
let mainArrSorted = mainArr.slice();
mainArrSorted.sort((a,b)=>(a[1]-b[1]));
console.log(mainArrSorted); 
// mainArrSorted = [['Mary', 17, 'student'], ['john', 27, 'teacher'], ['Jane', 40, 'police']];

Or if you don't want array sort, you can use this code:

let mainArr = [['john', 27, 'teacher'], ['Mary', 17, 'student'], ['Jane', 40, 'police']];
let mainArrSorted = mainArr.slice();
for(let i=0;i<mainArrSorted.length-1;i++){
    for(let j=i+1;j<mainArrSorted.length;j++){
        if(mainArrSorted[i][1]>mainArrSorted[j][1]){
            let temp = mainArrSorted[i];
            mainArrSorted[i] = mainArrSorted[j];
            mainArrSorted[j] = temp;
        }
    }
}
console.log(mainArrSorted);

edited Nov 5, 2018 at 22:48

answered Nov 5, 2018 at 22:21

protoproto

2,0991 gold badge15 silver badges15 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Bravo Over a year ago

you do realise you've also sorted mainArr - which may not be what is required

protoproto Over a year ago

You should use the builtin-functions (sort), it will quicker than the another function that you made!

Collectives™ on Stack Overflow

Sorting arrays inside an array [duplicate]

1 Answer 1

2 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Linked

Related