CODEWITHSUNDEEP
angularjs
David Klempfner
David Klempfner

Reputation: 9870

Angularjs brackets syntax

I was reading https://docs.angularjs.org/api/ng/function/angular.noop which has this example:

function foo(callback) {
  var result = calculateResult();
  (callback || angular.noop)(result);
}

I can't work out what this line is doing:

  (callback || angular.noop)(result);

It looks like callback and angular.noop are functions that can return true or false, but what is the value used for, and what does (result) do next to it?

Upvotes: 0

Views: 32

Answers (1)

charlietfl
charlietfl

Reputation: 171679

The left side determines which function reference to use and the right side invokes that function passing in result as parameter

In more verbose form it is the same as doing:

if (callback) {
  callback(result)
} else {
  angular.noop(result)
}

Upvotes: 1

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