JStructs

Structs for JavaScript, yay!!
A Ruby-like Struct factory for JavaScript

Installation

npm install jstructs [--save]

or

yarn install jstructs

Usage

const Struct  = require('jstructs');
const Contact = Struct('name', 'email', 'phone');
const bob     = new Contact('Bob', '[email protected]', 7779311);
const alice   = new Contact('Alice', '[email protected]', 8675309);

alice.equal(bob);

=> true // only compares properties

alice.deepEqual(bob);

=> false // compares properties and values

alice.each(function(value) {
  console.log(value);
});

=> 'Alice'
=> '[email protected]'
=> 8675309

bob.eachPair(function(name, value) {
  console.log(name, '=>', value);
});

=> name => Bob
=> email => [email protected]
=> phone => 7779311

alice.length();

=> 3

alice.properties();

=> ['name', 'email', 'phone']

bob.values();

=> ['Bob', '[email protected]', 7779311]

bob.valuesAt(0, 2, 5);

=> ['Bob', 7779311, undefined]

bob.valuesAt(0, 2, 5, true);

=> ['Bob', 7779311] // last value of true will remove falsey values

alice.select(function(value) {
  return typeof value === 'number';
});

=> [8675309]

alice.toArray();

// returns arrays of key value pairs
=> [['name', 'Alice'], ['email', '[email protected]'], ['phone', 8675309]]

bob.toObject();

// creates a new object from key value pairs
=> {
  'name': 'Bob',
  'email': '[email protected]',
  'phone': 8675309
}

Unlike Ruby Structs, you can pass in more arguments than there are properties.

const Struct  = require('jstructs');
const Numbers = Struct('pi', 'e', 'chaos', 'catchall');
const numbers = new Numbers(3.1415, 2.71828, 4.6692, 1.6180, -273.15, 6.71 * Math.pow(10, 8));

numbers.values();

=> [3.1415, 2.71828, 4.6692, [1.618, -273.15, 671000000]]

numbers.catchall;

=> [1.618, -273.15, 671000000]

You must pass at least one argument.

const Struct  = require('jstructs');
const fail = Struct();

=> Error