AngularJS | API Last Updated : 30 Apr, 2019 Summarize Suggest changes Share Like Article Like Report AngularJS APIs are used for comparing, iterating and converting objects.Basic AngularJS API includes angular.isString() angular.lowercase() angular.uppercase() angular.isNumber() 1. angular.isString() It is used to check whether an object is a string or not.It returns true if the object is string otherwise false. Example: html <!-- Write HTML code here --> <!DOCTYPE html> <html> <head> <script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"> </script> </head> <body> <div ng-app="gfg" ng-controller="gfgCntrl"> <p>{{ object }}</p> <p>{{ apiRes }}</p> </div> <script> var app = angular.module('gfg', []); app.controller('gfgCntrl', function($scope) { $scope.object = "GeeksForGeeks"; $scope.apiRes = angular.isString($scope.object); }); </script> </body> </html> Output: 2. angular.lowercase() It is used to convert all the characters of the string into lowercase characters. Example: html <!-- Write HTML code here --> <!DOCTYPE html> <html> <head> <script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"> </script> </head> <body> <div ng-app="gfg" ng-controller="gfgCntrl"> <p>{{ object }}</p> <p>{{ apiRes }}</p> </div> <script> var app = angular.module('gfg', []); app.controller('gfgCntrl', function($scope) { $scope.object = "GeeksForGeeks"; $scope.apiRes = angular.lowercase($scope.object); }); </script> </body> </html> Output: 3. angular.uppercase() It is used to convert all the characters of the string into uppercase characters. Example: html <!-- Write HTML code here --> <!DOCTYPE html> <html> <head> <script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"> </script> </head> <body> <div ng-app="gfg" ng-controller="gfgCntrl"> <p>{{ object }}</p> <p>{{ apiRes }}</p> </div> <script> var app = angular.module('gfg', []); app.controller('gfgCntrl', function($scope) { $scope.object = "GeeksForGeeks"; $scope.apiRes = angular.uppercase($scope.object); }); </script> </body> </html> Output: 4. angular.isNumber() It is used to check whether an object is a number or not. It returns true if object is a number otherwise false. Example: html <!-- Write HTML code here --> <!DOCTYPE html> <html> <head> <script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"> </script> </head> <body> <div ng-app="gfg" ng-controller="gfgCntrl"> <p>{{ object }}</p> <p>{{ apiRes }}</p> </div> <script> var app = angular.module('gfg', []); app.controller('gfgCntrl', function($scope) { $scope.object = "GeeksForGeeks"; $scope.apiRes = angular.isNumber($scope.object); }); </script> </body> </html> Output: Advertise with us Next Article AngularJS and W3.CSS A aman neekhara Follow Similar Reads AngularJS BasicsAngularJS TutorialAngularJS is a free and open-source JavaScript framework that helps developers build modern web applications. It extends HTML with new attributes and it is perfect for single-page applications (SPAs). 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