AngularJS - Default value when var is undefined

Question

I'm trying this:

$scope.items = {
    current: item.number || 1
};

And i'm getting: Error: item.number is undefined

How to set the current to 1 when item.numberis undefined?

I believe number should be current in the object. If so, use $scope.items = { current: this.current || 1 }; — Tushar
– Tushar, Commented Aug 12, 2015 at 11:02

James Brierley · Accepted Answer · 2015-08-12 10:59:55Z

4

This errors because item itself is undefined. Try:

current: item && item.number ? item.number : 1

If it's possible for item.number to be 0, change this to:

current: item && item.number !== undefined ? item.number : 1

0 is falsey so would be overwritten by 1 in the first case.

answered Aug 12, 2015 at 10:59

James Brierley

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1 Comment

Some parens here would be nice, would make this easier to read

GeoffreyB · Accepted Answer · 2015-08-12 10:59:36Z

1

Try this:

$scope.items = {
  current: (item && typeof item.number != "undefined") ? item.number : 1
};

answered Aug 12, 2015 at 10:59

GeoffreyB

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Tarun Dugar · Accepted Answer · 2015-08-12 10:59:52Z

0

Just use a simple if-else:

$scope.items = {}
if(item.number == undefined) {
    $scope.items.current = 1;
}
else {
    $scope.items.current = item.number;
}

answered Aug 12, 2015 at 10:59

Tarun Dugar

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