AngularJS Function Complete Reference Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Functions in AngularJS are used to perform some frequent tasks or clarify something. For example AngularJS angular.isArray() function is used to verify that the assigned object is an array or not. AngularJS Converting Functions:Function Description AngularJS angular.lowercase() Function The angular.lowercase() Function in AngularJS is used to convert the string into lowercase. AngularJS angular.uppercase() Function The angular.uppercase() Function in AngularJS is used to convert the string into uppercase. AngularJS angular.forEach() Function The angular.forEach() Function in AngularJS is used to iterate through each item in an array or object. AngularJS Comparing Functions :Function Description AngularJS angular.isArray() Function The angular.isArray() Function in AngularJS is used to return TRUE if the reference is an array and FALSE if it is not an array. AngularJS angular.isDate() Function The angular.isDate() function in AngularJS is used to determine whether the value of the date is valid or not. It returns true if the reference is a date else false. AngularJS angular.isDefined() Function The angular.isDefined() function in AngularJS is used to determine the value inside isDefined function is defined or not. It returns true if the reference is defined otherwise returns false. AngularJS angular.isElement() Function The angular.isElement() Function in AngularJS is used to determine if the parameter inside isElement function is a HTML DOM element or not. AngularJS angular.isFunction() Function The angular.isFunction() Function in AngularJS is used to determine if the parameter inside isFunction function is a function or not. It returns true if the reference is a function else false. AngularJS angular.isNumber() Function The angular.isNumber() function in AngularJS is used to determine the parameter inside isNumber function is a number or not. AngularJS angular.isObject() Function The angular.isobject() Function in AngularJS is used to determine if the parameter inside isobject function is an object or not. It returns true if the reference is an object or else false. AngularJS | angular.isString() Function The angular.isString() function in AngularJS is used to determine the parameter inside isString function is a string or not. AngularJS angular.isUndefined() Function The angular.isUndefined() function in AngularJS is used to determine the value inside isUndefined function is undefined or not. AngularJS angular.equals() Function The angular.equals() Function in AngularJS is used to compare two objects or two values whether these are the same or not. AngularJS angular.toJson() Function The angular.toJson() Function in AngularJS is used to serialize the javascript object into a JSON – formatted string. It takes the javascript object and returns a JSON string. 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