How to use itenary operator?

Question

I have conditional $stateParams on $state and i am trying to assign current $stateParams value to paramId. How can i achieve that task using ternary operator?

commonCtrl.js

 var paramId = $stateParams.processId:? $stateParams.assessmentId;

config.js

.state('app.addPrcChallenge', {
            url: '/add/prcChallenge/:processId/:assessmentId?',
            templateUrl: 'views/process/processChallenge.html',
            controller: 'ProcessChallengesCtrl',
            data: {
                authenticate: true
            },

Side note - it's called a *ternary* operator – Hacknightly Apr 27 '16 at 20:52 — Hacknightly, Apr 27 '16 at 20:52
Side note - you can not place : and ? together – Redu Apr 27 '16 at 20:55 — Redu, Apr 27 '16 at 20:55

score 2 · Answer 1 · answered Apr 27 '16 at 20:51

2

You are close. Try this:

var paramId = $stateParams.processId ? $stateParams.processId : $stateParams.assessmentId;

answered Apr 27 '16 at 20:51

Hacknightly

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why we assigning `$stateParams.processId` twice ? – hussain Apr 27 '16 at 21:06
@hussain - It's not assigning it twice. – RJM Apr 27 '16 at 21:17
You could use `||` instead. – evolutionxbox Apr 28 '16 at 00:00

score 1 · Answer 2 · answered Apr 27 '16 at 20:52

1

Unfortunately javascript doesn't posses a null coalescing operator like C# does but you could achieve pretty much the same effect with this construct:

var paramId = $stateParams.processId || $stateParams.assessmentId;

Basically this means that paramId will equal to $stateParams.processId if it has some value different than undefined and equal to $stateParams.assessmentId otherwise.

answered Apr 27 '16 at 20:52

Darin Dimitrov

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Any reason for the downvote? – Darin Dimitrov Apr 27 '16 at 21:00
I can't see one. I prefer your answer. – evolutionxbox Apr 28 '16 at 00:00

How to use itenary operator?

2 Answers2