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 0.94 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`
`math`, Math Operators	Math operators	Math operators	Math operators	Math operators
`cp`	`shutil.copy`			`fs::copy`
`date`	`datetime.date.today`	`java.time.LocalDate.now`
`drop`	`list[:-3]`
`du`, `ls --du`	`shutil.disk_usage`
`each` `for`	`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]`
`length`	`len`	`size`, `length`	`length`	`len`
`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`
`print`	`print`	`println`	`printf`	`println!`
`ps`	`os.listdir('/proc')`
`pwd`	`os.getcwd`			`env::current_dir`
`range` type	`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`
`str stats` `str length` `length`	`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}`
`math sum`	`sum`	`sum`	`reduce`	`sum`
`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` `$env.FOO = "bar"`	`os.environ`
`where`	`filter`	`filter`	`filter`	`filter`
`which`	`shutil.which`
`wrap`	`{ "key" : val }`