https://github.com/default-writer/lazyeval

Minimalist Lazy Evaluation JavaSctipt famework
https://github.com/default-writer/lazyeval

Last synced: about 1 year ago
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Minimalist Lazy Evaluation JavaSctipt famework

• Host: GitHub
• URL: https://github.com/default-writer/lazyeval
• Owner: default-writer
• License: mit
• Created: 2018-08-01T13:48:31.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2022-07-21T07:30:51.000Z (almost 4 years ago)
• Last Synced: 2025-04-05T07:15:25.797Z (over 1 year ago)
• Language: JavaScript
• Homepage:
• Size: 16.6 KB
• Stars: 1
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# lazyeval

Minimalist Lazy Evaluation JavaSctipt famework

```js

let lazy = (eval) => ((data) => new Proxy(data, {

  set(obj, key, val) {

      obj[key] = val;

      eval(obj);

  }

}))({});

```

https://github.com/hack2root/lazyeval

[![install size](https://packagephobia.now.sh/badge?p=@root_admin/lazyeval@1.0.1)](https://packagephobia.now.sh/result?p=@root_admin/lazyeval@1.0.1)

## Example

- func is a proxy for an empty objct {}

- func calls evaluation function every time you write to existing, new or user defined properties

- func updates internal object and passes it as an argument for every call to evaluation function

- f is a parameter pointing to the internal representation of the external object {}

- c is not evaluated until all requirements for evaluation is met for evaluation function

```js

describe('let func = lazy((f) => { if (f.a && f.b) { c = f.a + f.b } })', function () {

  it('should add two numbers', function () {

    // 1. ARRANGE

    let a = 1;

    let b = 2;

    let c;

    // 2. ACT

    let func = lazy((f) => {

      if (f.a && f.b) { 

        c = f.a + f.b 

      }

    });

    func.a = a;

    func.b = b;

    // 3. ASSERT

    expect(c).to.be.equal(3);

  });

});

```