We will iterate over the array, checking for the existence of each element in the object, if we found a string that’s not a key of object, we exit and return false, otherwise we return true. Here is the code for doing the same − Example const obj = { 'name': 'Ashish Kumar'...
Object.keys()is a static method that returns an Array when we pass an object to it, which contains the property names (keys) belonging to that object. We can check whether thelengthof this array is0or higher - denoting whether any keys are present or not. If no keys are present, the...
Object.entries() Method The Object.entries() method takes an object as an argument and returns an array of its enumerable property [key, value] pairs. We can then use the .length property of the array to check if it contains any item: const user = {} Object.entries(user).length ===...
check.contains(object, value): Returnstrueifobjectcontainsvalue,falseotherwise. check.in(value, object): Returnstrueifvalueis inobject,falseotherwise. check.containsKey(object, key): Returnstrueifobjectcontains keykey,falseotherwise. check.keyIn(key, object): Returnstrueif keykeyis inobject,falseothe...
private static void log(Object object) { System.out.println(object); } } In above tutorial we are using Java’sshort if else– ternary operator?. It’s a shortened version of anif elsecommand. Here we are adding3 key,value pairsto mapcrunchifyCompaniesHashmap. We have created two...
A step-by-step guide on how to check if an array contains an object in JavaScript.
Read this tutorial and find methods of checking whether a JavaScript object is empty or not. Choose the best one for you and get the code immediately.
JavaScript offers many ways to check if a string contains a substring. Learn the canonical way, and also find out all the options you have, using plain JavaScript
Alternatively, it can also be used astypeof()methodin JavaScript. Syntax: typeof(variable); Example 1: str="This is my place.";if(typeofstr==String){console.log('The variable is a String.');}else{console.log('The variable is not a String.');} ...
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