accessing an object inside array in javascript

Question

Here is an example of state machine I intend to build

  this.statemachine =
      {
           state: 'idle',
           transitions:
           {
                  idle:{
                          ebaseinit: function ()
                          {
                             console.log("Firebase Init complete");
                          } ,

                          coreinit : function ()
                          {
                             console.log("Firestore Init complete");
                          }

                       },
                   ready:
                      {
                         fetchdata : function ()
                         {
                           console.log("Getting                                   data");
                         }
                         

                      }    
           }
      }

Depending on the event that occurs I need to invoke respective function. Tried this.statemachine.transitions.indexof("idle") It does not work. Any suggestion to implement accessing the function without using direct numbers like this.statemachine.transitions[1] etc should help

this.statemachine.transitions[ this.statemachine.state ]?

Thum Choon Tat
– Thum Choon Tat

2018-05-24 09:36:39 +00:00
Commented May 24, 2018 at 9:36 — Thum Choon Tat
– Thum Choon Tat, Commented May 24, 2018 at 9:36

Cristian S. · Accepted Answer · 2018-05-24 09:40:02Z

1

You can catch the event name and use it as an object key.

this.statemachine.transitions['ready']

answered May 24, 2018 at 9:40

Cristian S.

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Comments

Nijeesh K J · Accepted Answer · 2018-05-24 09:54:30Z

1

First thing you have to understand is statemachine.transitions is not an array it is an object thats why you cant use indexOf on it

if(this.statemachine.transitions)
 let obj = this.statemachine.transitions[statemachine.state]

or

You can use a for loop to iterate through the object and find what you are looking for

if (this.statemachine.transitions){
      for (var key in this.statemachine.transitions) {
        if (this.statemachine.transitions.hasOwnProperty(key)) {
          if(this.statemachine.state == key){
            console.log(this.statemachine.transitions[key])
          }
        }
      }
    }

edited May 24, 2018 at 9:54

answered May 24, 2018 at 9:48

Nijeesh K J

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