Misago/frontend/src/utils/batch.js

export default function(list, rowWidth, padding=false) {
  let rows = [];
  let row = [];

  list.forEach(function(element) {
    row.push(element);
    if (row.length === rowWidth) {
      rows.push(row);
      row = [];
    }
  });

  // pad row to required length?
  if (padding !== false && row.length > 0 && row.length < rowWidth) {
    for (let i = row.length; i < rowWidth; i ++) {
      row.push(padding);
    }
  }

  if (row.length) {
    rows.push(row);
  }

  return rows;
}