export function contains(array, target) {
  return array.indexOf(target) !== -1;
}
export function remove(array, target) {
  return array.splice(array.indexOf(target), 1);
}
export function merge(target, source) {
  for (const item of source) {
    target.push(item);
  }

  return target;
}
export function from(source) {
  return merge([], source);
}
export function findIndex(array, func) {
  for (let i = 0; i < array.length; i++) {
    if (func(array[i], i, array)) {
      return i;
    }
  }

  return -1;
}
export function find(array, func) {
  return array[findIndex(array, func)];
}
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