> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/h.md).

# H

- [Hailstone sequence](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hailstone_sequence.md)
- [Hamming numbers](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hamming_numbers.md)
- [Handle a signal](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/handle_a_signal.md)
- [Happy numbers](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/happy_numbers.md)
- [Harshad or Niven series](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/harshad_or_niven_series.md)
- [Hash from two arrays](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hash_from_two_arrays.md)
- [Hash join](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hash_join.md)
- [Haversine formula](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/haversine_formula.md)
- [Hello world](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hello-world.md)
- [Graphical](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hello-world/graphical.md)
- [Line printer](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hello-world/line_printer.md)
- [Newline omission](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hello-world/newline_omission.md)
- [Standard error](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hello-world/standard_error.md)
- [Text](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hello-world/text.md)
- [Web server](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hello-world/web_server.md)
- [Here document](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/here_document.md)
- [Heronian triangles](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/heronian_triangles.md)
- [Hickerson series of almost integers](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hickerson_series_of_almost_integers.md)
- [Higher-order functions](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/higher-order_functions.md)
- [Hilbert curve](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hilbert_curve.md)
- [History variables](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/history_variables.md)
- [Hofstadter-Conway 10 000 sequence](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hofstadter-conway_10_000_sequence.md)
- [Hofstadter Figure-Figure sequences](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hofstadter_figure-figure_sequences.md)
- [Hofstadter Q sequence](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hofstadter_q_sequence.md)
- [Holidays related to Easter](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/holidays_related_to_easter.md)
- [Home primes](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/home_primes.md)
- [Honaker primes](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/honaker_primes.md)
- [Honeycombs](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/honeycombs.md)
- [Horizontal sundial calculations](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/horizontal_sundial_calculations.md)
- [Horner's rule for polynomial evaluation](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/horners_rule_for_polynomial_evaluation.md)
- [Hostname](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hostname.md)
- [Hough transform](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hough_transform.md)
- [HTTP](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/http.md)
- [HTTPS](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/https.md)
- [Authenticated](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/https/authenticated.md)
- [Huffman coding](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/huffman_coding.md)
- [Humble numbers](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/humble_numbers.md)