How can I parse String to Int in an Angular expression?

Question

A number string '5'

var num_str = '5'; 

How can I parseInt and let below answers correct at the same time?

{{num_str + 1}}  // 6 {{num_str - 1}}  // 4 

parseInt can't be used in an Angular expression,

{{parseInt(num_str) - 1}}     

number filter can't do add and minus,

{{num_str - 1 | number}} 

If anyone have useful suggestion, I will very appreciate of you

Answer 1

In your controller:

$scope.num_str = parseInt(num_str, 10);  // parseInt with radix