Nu map from imperative languages
The idea behind this table is to help you understand how Nu built-ins and plugins relate to imperative languages. We've tried to produce a map of programming-relevant Nu commands and what their equivalents are in other languages. Contributions are welcome.
Note: this table assumes Nu 0.43 or later.
| Nushell | Python | Kotlin (Java) | C++ | Rust |
|---|---|---|---|---|
| append | list.append, set.add | add | push_back, emplace_back | push, push_back |
| math avg | statistics.mean | |||
| calc, = math | math operators | math operators | math operators | math operators |
| count | len | size, length | length | len |
| cp | shutil.copy | fs::copy | ||
| date | datetime.date.today | java.time.LocalDate.now | ||
| drop | list[:-3] | |||
| du | shutil.disk_usage | |||
| each | for | for | for | for |
| exit | exit | System.exit, kotlin.system.exitProcess | exit | exit |
| http get | urllib.request.urlopen | |||
| first | list[:x] | List[0], peek | vector[0], top | Vec[0] |
| format | format | format | format | format! |
| from | csv, json, sqlite3 | |||
| get | dict["key"] | Map["key"] | map["key"] | HashMap["key"], get, entry |
| group-by | itertools.groupby | groupBy | group_by | |
| headers | keys | |||
| help | help | |||
| insert | dict["key"] = val | map.insert({ 20, 130 }) | map.insert("key", val) | |
| is-empty | is None, is [] | isEmpty | empty | is_empty |
| take | list[:x] | &Vec[..x] | ||
| take until | itertools.takewhile | |||
| take while | itertools.takewhile | |||
| kill | os.kill | |||
| last | list[-x:] | &Vec[Vec.len()-1] | ||
| lines | split, splitlines | split | views::split | split, split_whitespace, rsplit, lines |
| ls | os.listdir | fs::read_dir | ||
| match | match | when | match | |
| merge | dict.append | map.extend | ||
| mkdir | os.mkdir | fs::create_dir | ||
| mv | shutil.move | fs::rename | ||
| get | list[x] | List[x] | vector[x] | Vec[x] |
| open | open | |||
| transpose | zip(*matrix) | |||
| http post | urllib.request.urlopen | |||
| prepend | deque.appendleft | |||
| println | printf | println! | ||
| ps | os.listdir('/proc') | |||
| pwd | os.getcwd | env::current_dir | ||
| range | range | .., until, downTo, step | iota | .. |
| reduce | functools.reduce | reduce | reduce | fold, rfold, scan |
| reject | del | |||
| rename | dict["key2"] = dict.pop("key") | map.insert("key2", map.remove("key").unwrap()); | ||
| reverse | reversed, list.reverse | reverse, reversed, asReversed | reverse | rev |
| rm | os.remove | |||
| save | io.TextIOWrapper.write | |||
| select | {k:dict[k] for k in keys} | |||
| shuffle | random.shuffle | |||
| size | len | len | ||
| skip | list[x:] | &Vec[x..],skip | ||
| skip until | itertools.dropwhile | |||
| skip while | itertools.dropwhile | skip_while | ||
| sort-by | sorted, list.sort | sortedBy, sortedWith, Arrays.sort, Collections.sort | sort | sort |
| split row | str.split{,lines}, re.split | split | views::split | split |
| str | str functions | String functions | string functions | &str, String functions |
| str join | str.join | joinToString | join | |
| str trim | strip, rstrip, lstrip | trim, trimStart, trimEnd | regex | trim, trim*{start,end}, strip*{suffix,prefix} |
| sum | sum | sum | reduce | sum |
| sys | sys | |||
| to | import csv, json, sqlite3 | |||
| touch | open(path, 'a').close() | |||
| uniq | set | Set | set | HashSet |
| upsert | dict["key"] = val | |||
| version | sys.version, sys.version_info | |||
| with-env | os.environ | |||
| where | filter | filter | filter | filter |
| which | shutil.which | |||
| wrap | { "key" : val } |