array.ts

const fromArray = <T extends object>(a: Array<T>): IQueryable<T> => {
  const exprs: Expr[] = []
  const value = [...a]

  return {
    where(predicate) {
      exprs.push(predicate(builder()).GetExpr())
      return this
    },
    toArray() {
      const result = exprs.reduce((res, e) => res.filter(i => runExpr(e, i)), value)
      return Promise.resolve(result)
    }
  }
}