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undefsafe

Undefined safe way of extracting object properties

undefsafe

Simple function for retrieving deep object properties without getting "Cannot read property 'X' of undefined"

Can also be used to safely set deep values.

Usage

var object = {
  a: {
    b: {
      c: 1,
      d: [1,2,3],
      e: 'remy'
    }
  }
};
 
console.log(undefsafe(object, 'a.b.e')); // "remy" 
console.log(undefsafe(object, 'a.b.not.found')); // undefined 

Demo: https://jsbin.com/eroqame/3/edit?js,console

Setting

var object = {
  a: {
    b: [1,2,3]
  }
};
 
// modified object 
var res = undefsafe(object, 'a.b.0', 10);
 
console.log(object); // { a: { b: [10, 2, 3] } } 
console.log(res); // 1 - previous value