Meta toolkit

Meta toolkit is a toolkit to help with meta programming and OOP. It is a no-dependency, no-nonsense collection of small bits my projects accumulated over the years. They deal with helping to generate classes, objects, prototypes, iterators, and more.

• Name mangling (meta-toolkit/names.js) provides a conversion from compound names such as foo-bar to ['foo', 'bar'] and from ['foo', 'bar'] to fooBar and vice versa.
  • Used to generated file names, method names, and so on.
  • The following naming schemas are supported out of box:
    • camelCase — toCamelCase(), fromCamelCase().
    • PascalCase — toPascalCase(), fromPascalCase().
    • snake_case — toSnakeCase(), fromSnakeCase().
      • SNAKE_CASE — toAllCapsSnakeCase().
    • kebab-case — toKebabCase(), fromKebabCase().
• Descriptor manipulation (meta-toolkit/descriptors.js) provides a set of helpers used to generate various accessors dynamically and share them between different objects/prototypes:
  • Create descriptors — makeGetter(), makeSetter(), makeAccessors().
  • Add descriptors — addDescriptor(), addDescriptors(), addAccessor(), addGetters().
  • Copy descriptors — copyDescriptors().
• Aliases (meta-toolkit/aliases.js) provides a set of helpers to alias existing properties:
  • Alias properties — addAlias(), addAliases().
• Prototypes (meta-toolkit/prototypes.js) provides a set of helpers to inspect prototypes:
  • Iterate over prototypes — prototypes().
  • getPropertyDescriptor() — similar to getOwnPropertyDescriptor(), but for all prototypes not just the current object.
• Iterators (meta-toolkit/iterators.js) provides a set of helpers simplify creating custom iterators:
  • Augment iterable with an iterator interface — augmentIterator(), normalizeIterator().
  • Add array-like methods if not present — mapIterator(), filterIterator().
• Path (meta-toolkit/path.js) provides a set of helpers to work with embedded objects in a simple way:
  • Get value from a nested object by path — get().
  • Set value in a nested object by path — set().
• Options (meta-toolkit/options.js) provides a set of helpers to organize options for constructors:
  • Copy options according to some defaults — copyOptions().
• Comparators (meta-toolkit/comparators.js) provides a set of helpers to convert between different types of comparator functions:
  • Create a compare function from a less function and vice versa — compareFromLess(), lessFromCompare().
  • Create an equality function from a less function — equalFromLess().
  • Reverse comparators — reverseCompare(), reverseLess().

See the full documentation in the wiki.

Examples

Generating names:

import {toCamelCase, toPascalCase, toSnakeCase,
  toAllCapsSnakeCase, fromKebabCase} from 'meta-toolkit/names.js';

const names = fromKebabCase('foo-bar-baz');

console.log(toCamelCase(names));        // fooBarBaz
console.log(toPascalCase(names));       // FooBarBaz
console.log(toSnakeCase(names));        // foo_bar_baz
console.log(toAllCapsSnakeCase(names)); // FOO_BAR_BAZ

Aliasing properties:

import {addAliases} from 'meta-toolkit/aliases.js';

class Foo {
  constructor() { this.value = 0; }
  get double() { return this.value * 2; }
  line(a, b) { return a * this.value + b; }
}
addAliases(Foo.prototype, {
  double: 'x2, duplicate',
  line: 'linear'
});

const f = new Foo(2);

console.log(f.double);       // 4
console.log(f.x2);           // 4
console.log(f.linear(1, 2)); // 4

Object manipulation with paths:

import {set, get, remove, forceSet} from 'meta-toolkit/path.js';

const object = {};

forceSet(object, 'a.b.c', 1); // object = {a: {b: {c: 1}}}

get(object, 'a.b.c');         // 1
get(object, 'a');             // {b: {c: 1}}

set(object, 'a.b.c', 2);      // object = {a: {b: {c: 2}}}
set(object, 'a.b.d', 3);      // object = {a: {b: {c: 2, d: 3}}}

remove(object, 'a.b.c');      // object = {a: {b: {d: 3}}}
remove(object, 'a.b');        // object = {a: {}}

License

BSD 3-Clause "New" or "Revised" License. See the LICENSE file for details.

Release History

• 1.1.3 Technical release: added types to package.json.
• 1.1.2 Added TS types.
• 1.1.1 Updated deps.
• 1.1.0 Added comparator utilities.
• 1.0.0 Initial release.