burakcan/mb

Exception-free nested nullable attribute accessor

mb

Exception-free nested nullable attribute accessor. An alternative to facebookincubator/idx in 38 bytes.

---

Install

Just copy/paste this function into your project:

var mb=p=>o=>p.map(c=>o=(o||{})[c])&&o

Alternatively, you can download mb.js.

Use

var getHello = mb(["a", "b", 0, "hello"]);
var getHelloLength = mb(["a", "b", 0, "hello", "length"]);

var obj1 = {
  a: {
    b: [{ hello: "world" }]
  }
};

var obj2 = {
  c: {
    d: "e"
  }
};

getHello(obj1); // world
getHelloLength(obj1); // 5

getHello(obj2); // undefined
getHelloLength(obj2); // undefined

Contribution and Code-Golfing

1. Clone and shorten current code.
2. Please open test.html in your browser and open console to see if all the tests pass.

Contributors

• Fatih Kadir Akin
• Burak Can
• Eser Ozvataf
• Cahit Gürgüc
• Alper Tekinalp
• Max Gerber
• Cem Ekici
• Atanas Minev
• Peter Levi

mb's Issues

mb(0, 1)([0]) yields 0 instead of undefined

Explanation of how this works ?

Hi,

Just discovered the library and was wondering if you could provide an explanation for those of us who are lost by the syntax ? It's always great to learn something new about javascript 😄

Remove 'var ', save 4 bytes

What would be the implications? Linters should currently complain anyway.