Function modifyCollection

client/src/state/collections.tsx:176–180

(state: Collection[], id: number, f: (c: Collection) => void)

}

function modifyCollection(state: Collection[], id: number, f: (c: Collection) => void) {
  const s = JSON.parse(JSON.stringify(state));
  mod(s, id, f);
  return s;
}

function mod(collections: Collection[], id: number, f: (c: Collection) => void) {
  for (let i = 0; i < collections.length; i++) {