Javascript a value is an object1 2 3 4 5 6 7 8 9 10 11 12 13 // Returns if a value is an object let obj = { siteName: 'W3Docs', }; let str = 'W3Docs'; function isObject(objValue) { return objValue && typeof objValue === 'object' && objValue.constructor === Object...
To check if a value is an object, the above isObject() method does the following:Use the typeof operator to verify that the variable type is object— typeof obj === 'object'. Verify the value is not null— obj !== null. Use the Array.isArray() method to verify that the value ...
As discussed above, users can check if a variable is null or undefined using theOR (||)operator. It checks if the variable satisfies either of the two conditions. When users use it with two Boolean values, the OR operator will return a "true" value if it considers both conditions true. ...
// Undefined variableleta;if(a ==null) {console.log('Null or undefined value!'); }else{console.log(a); } This would check whetheraiseithernullorundefined. Sinceaisundefined, this results in: Null or undefined value! Though, we don't really know which one of these is it. If we were...
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if(val===null||val==="") Example Here, we will create a variable “val” and assigned a “null” value to it: varval=null; Then, we will use the OR operator with strict equality operator in the “if” conditional statement to verify whether the variable is null or empty: ...
They are not equivalent. The first will execute the block following theifstatement ifmyVaristruthy(i.e. evaluates totruein a conditional), while the second will execute the block ifmyVaris any value other thannull. The only values that are not truthy in JavaScript are the following (a.k....
This tutorial teaches how to check if a variable is not null in JavaScript. if(myVar){...} This way will evaluate totruewhenmyVarisnull, but it will also get executed whenmyVaris any of these: undefined null 0 ""(the empty string) ...
publicclassCheckIfIntIsNullExample{publicstaticvoidmain(String[]args){// Part 1: Primitive intintprimitiveInt=0;System.out.println("Primitive int value: "+primitiveInt);// Part 2: Nullable IntegerInteger nullableInt=null;System.out.println("Nullable Integer value: "+nullableInt);// Part 3: ...
Ensure the value is notundefinedornullusingArray.prototype.includes(). Compare theconstructorproperty on the value withtypeto check if the provided value is of the specifiedtype. constis=(type,val)=>![,null].includes(val)&&val.constructor===type;// Examplesis(Array,[1]);// trueis(ArrayBuff...