prototoy

Lightweight JavaScript object generator for your node REPL (or elsewhere, I suppose).

Usage

prototoy is not intended to be a full-fledged object generation library rather, it's intended for use in your Node.js REPL when you need a quick dummy object to toy around with.

It's recommended that you load prototoy when you run node interactively. I recommend setting up a .noderc file with the following:

const t = require('prototoy');

If you don't want to setup a .noderc file how to do this depends on whether you want it available locally or globally.

Locally

npm install prototoy or yarn install prototoy

Load prototoy when you run node as a REPL in your project:

node -e 'const t = require("prototoy")' -i

Globally

npm install prototoy -g or yarn install prototoy -g

Load prototoy when you run node as a REPL. Here's one way to do it:

# In your shell's config (Bash here):
inode() {
  NODE_PATH=$(npm config get prefix)/lib/node_modules node -e 'const t = require("prototoy")' -i
}

Now you can easily generate objects to test things with:

> t.string(5)  // or t.str() or t.s()
'd zzzz ww uuuuuuu aa'

> t.array()    // or t.a()
[ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]

> t.array(5, Date)
[ 2018-02-11T05:50:06.271Z,
  2018-02-12T05:50:06.271Z,
  2018-02-13T05:50:06.271Z,
  2018-02-14T05:50:06.271Z,
  2018-02-15T05:50:06.271Z ]

> t.obj() // or t.o() or t.object()
{ a: 1, b: 2, c: 3, d: 4, e: 5, f: 6, g: 7, h: 8, i: 9, j: 10 }

> t.obj(2)
{ a: 1, b: 2 }

> t.obj(['foo', 'bar'])
{ foo: 1, bar: 2 }

> i = t.iter(2) // or t.i()
{}
> i.next()
{ value: 1, done: false }
> i.next()
{ value: 2, done: false }
> i.next()
{ value: undefined, done: true }

> i = t.iter(2, true)  // true means it will cycle; also: t.cycle()
{}
> i.next()
{ value: 1, done: false }
> i.next()
{ value: 2, done: false }
> i.next()
{ value: 1, done: false }
> i.next()
{ value: 2, done: false }
> i.next()
{ value: 1, done: false }
...

> i = t.iter(['foo', 'bar'], true)
{}
> i.next()
{ value: 'foo', done: false }
> i.next()
{ value: 'bar', done: false }
> i.next()
{ value: 'foo', done: false }
...

> t.map(2) // or t.m()
Map { 'a' => 1, 'b' => 2 }

> t.map(2, Number)
Map { 1 => 1, 2 => 2 }

> t.map(2, Number, Boolean)
Map { 1 => true, 2 => false }

And others...

API

All functions will create items of defaultLength length/size if no arguments are given.

array([length [, type|function])

Arguments

• length - The length of the array to create, defaults to defaultLength
• type|function - The type of object to generate or a function that will be called to generate each element.

type can be one of Date, Number, Object, Boolean or String.

The function's signature is callback(index), where index starts at 0.

Returns

An array.

cycle([list])

Same as iterator(list, true)

json([properties])

Generate some JSON.

Can also be called as j.

Arguments

properties - An array of property names to use

Returns

A JSON string.

map([spec [, keyType [, valueType]]])

Can also be called as m.

Arguments

• spec - An integer representing the number of entries to generate or an array of key names to use
• keyType - The key's data type, defaults to String
• valueType - The value's data type, defaults to an integer

Returns

An instance of Map populated according to the arguments.

object([spec])

Generate an object with some properties.

Can also be called as o.

Arguments

• spec - An integer representing the number of properties to add to the object or an array of property names to create.

Returns

An object as defined by spec.

iterator(spec, [cycle = false])

Create an iterator. Can also be called as iter or i.

Arguments

• spec - An integer representing the number of entries to generate or an array of values to use in the generator
• cycle - If true the iterator's done property will never be false. You will iterate "forever".

Returns

An iteratable object create by a Generator.

set()

Same arguments as array(), excepts it returns a Set.

string([length])

Return a string containing length words. length defaults to defaultLength.

Can also be called as s.

See Also

• Pry-Toys - The Ruby library that served as inspiration
• randexp
• Chance
• randomstring
• random-input-generator
• templated-object-generator
• unionized

Author

Skye Shaw (skye.shaw -AT- gmail)

License

Released under the MIT License: http://www.opensource.org/licenses/MIT