Your question is more of a javascript question than angularjs one unless you are talking about using a filter to do it. You could use that code to do it if your number will always have 4 digits:
app.filter('addDelimiter', function () {
return function (number) {
var firstPart = number.slice(0,2);
var lastPart = number.slice(2,4);
var delimeter = "https://stackoverflow.com/";
var result = firstPart +delimeter+lastPart;
return result
};
});
With that filter you would be able to use it like that
{{ number | addDelimiter}}
and it would return xx/xx
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solved Format a number xxxx to be xx/xx in AngularJS?