AngularJS filter to crop text and respect word boundaries

Crop.js

'use strict';
app.filter('crop', function(){
	return function(input, limit, respectWordBoundaries, suffix){
		if (input === null || input === undefined || limit === null || limit === undefined || limit === '') {
			return input;
		}
		if (angular.isUndefined(respectWordBoundaries)) {
			respectWordBoundaries = true;
		}
		if (angular.isUndefined(suffix)) {
			suffix = '...';
		}

		if (input.length <= limit) {
			return input;
		}

		limit = limit - suffix.length;

		var trimmedString = input.substr(0, limit);
		if (respectWordBoundaries) {
			return trimmedString.substr(0, Math.min(trimmedString.length, trimmedString.lastIndexOf(" "))) + suffix;
		}
		return trimmedString + suffix;
}
});

usage.txt

{{'My super cool text which is very long' | crop:25}}             <!-- My super cool text... -->
{{'My super cool text which is very long' | crop:25:false}}       <!-- My super cool text whi... -->
{{'My super cool text which is very long' | crop:25:true:'!!!'}}  <!-- My super cool text whi!!! -->
{{'My super cool text which is very long' | crop:999:true:'!!!'}} <!-- My super cool text which is very long -->

nice