Crow by Example

One short, runnable program per area of the language. The chapters taught the ideas; this is every corner of the language and its modules in example form, to read through once and come back to. Every block is executed by crow test --book in both execution modes, and crow test --docs fails the build if any builtin or module has no example here or in the chapters. For the tables, with every function linked back to the example that shows it, see The Standard Library in Part II.

Page	Covers
Numbers and conversion	abs sqrt floor ceil round min max type int float str
Strings	trim upper lower replace starts ends repeat split join reverse len, indexing
Formatting	fmt with decimals commas percent width fill align
Regular expressions	matches find sub
Arrays	sort reverse slice push pop concat contains range
Maps	map keys values has set del
Files and directories	mkdir write exists read cp mv ls rm, error values from I/O
JSON	json encode, converting open-schema fields
The system: shell, environment, time, arguments	shell env time args hash
Moments and freshness	moment calendar parse_time now captured, fmt[t, time =]
Math: tensors	creating tensors, element-wise functions, shape operations
Math: reductions and linear algebra	sum mean min max argmax cumsum sort argsort topk unique where, solve inv det svd qr eigen norm dot lstsq
Math: random, signal, special, and sparse	seed rand randn normal shuffle choice, fft conv hamming stft lowpass, gamma erf bessel complex, sparse dense nnz spmv
Automatic differentiation	grad for one and many parameters
Statistics: use math.stats	median std var percentile corr linreg
Neural-network building blocks: use math.nn	relu sigmoid softmax mse
Structured files: use io	csv lines
Frames: use frame	frame.load filter sort select head group, column reductions
Databases: use db	connect exec query transact
Web: a JSON route	route serve, a JSON response
Web: responses, auth, sessions, and sockets	text html redirect respond msgpack arrow bytes sign verify sessions cache limit templates render uploads send recv close smtp
Views: the whole element vocabulary	all 32 elements, fetch poll field