Concatenating lists and sequences

If you have several lists that you need to run through a side-effect, it's usually a good choice to concatenate these lists together. It's easier for side-effects to iterate over one collection than several of them.

Simple value concatenation

The best way to think about concatenating lists together is as basic addition. You're effectively adding lists together, resulting in a larger list. You use the concat() method to concatenate lists:

const myList1 = List.of(1, 2, 3);
const myList2 = List.of(4, 5, 6);
const myList3 = List.of(7, 8, 9);
const myCombinedList = myList1.concat(
  myList2,
  myList3
);

console.log('myList1', myList1.toJS());
// -> myList1 [ 1, 2, 3 ]
console...