JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="parse1">
    <div ng-controller="parseController">
        <input ng-model="expr"type="text" placeholder="Enter an expression" />
        <h2>{{ parsedValue }}</h2>
    </div>
</div>

JavaScript

var parseApp = angular.module('parse1',[]);
parseApp.controller('parseController', ['$scope','$parse', function($scope,$parse){
	$scope.parsedValue = "Testing";
	$scope.$watch('expr',function(newVal,oldVal,scope){
		if(newVal !== oldVal){
			var parseFun = $parse(newVal);
			$scope.parsedValue = parseFun(scope);
		}
	});
}])