Use Object. keys(obj). length to check if it is empty.
Read moreHow do you check if a value is null?
JavaScript uses the null value to represent a missing object. Use the strict equality operator ( === ) to check if a value is null . The typeof null returns ‘object’ , which is historical bug in JavaScript that may never be fixed.
Read moreHow do you check if a value is undefined or null in TypeScript?
You can use the qualities of the abstract equality operator to do this: if (variable == null){ // your code here. } Because null == undefined is true, the above code will catch both null and undefined .
Read moreIS null check in TypeScript?
Undefined is the default value for uninitialized variables But TypeScript never assigns null to any variable . We have to assign Null to variable to make it null. Note that in the example above foo is of type any, which means that no type checking.
Read moreIS null check in JavaScript?
Javascript null is a primitive type that has one value null. JavaScript uses the null value to represent a missing object. Use the strict equality operator ( === ) to check if a value is null . The typeof null returns ‘object’ , which is historical bug in JavaScript that may never be fixed.
Read moreHow do you check for blank and null in JavaScript?
Checking for only null or undefined can be done like so: if (value == null) . Mind the == operator that coerces. If you check like this if (value === null || value === undefined) , you forgot/don’t know how Javascript coerces.
Read moreHow do you check for undefined and null?
Example 2: using typeof The typeof operator for undefined value returns undefined . Hence, you can check the undefined value using typeof operator. Also, null values are checked using the === operator .
Read more