delve

Delve recursively into a value to retrieve a property; without erroring.

delve

Delve recursively into a value to retrieve a property; without erroring.

It sucks to have to do if ( obj && obj.prop && obj.prop.secondProp ) { ... }.

var delve = require('delve')
 
var o = { x: { y: { z: 'my val' } } }
 
delve(o, 'x.y')               //= { z: 'my val' } 
delve(o, 'x.y.z')             //= 'my val' 
delve(o, 'x.y.z.foo')         //= undefined 
delve(undefined, 'x.y.z.foo') //= undefined 
delve(null, 'x.y.z.foo')      //= undefined 
delve('foo', 'length')        //= 3 
var delve = require('delve')
 
delve.has({ x: { y: undefined } }, 'x.y') //= true 
delve.has('foo', 'length')                //= true 
delve.has(null, 'foo')                    //= false 
delve.has({ x: { } }, 'x.y')              //= false 

For more examples, see tests/delve-test.js.

npm install delve

Download src/delve.js, and include it as a script tag.

Download src/delve.js, and require it in:

require(['libs/delve'], function(delve){
  // ... assuming delve is in libs/delve, now it's ready to use 
})