Interview Questions on HTML

Undeclared variables are those that are not declared in the program (do not exist at all),trying to read their values gives runtime error.But if undeclared variables are assigned then implicit declaration is done . Undefined variables are those that are not assigned any value but are declared in the program.Trying to read such variables gives … Read more

No.Javascript does not have block level scope,all the variables declared inside a function possess the same level of scope unlike c,c++,java. In JavaScript, variables have either global scope or function scope, but not block scope. This means that variables declared within a function are local to that function and not accessible outside of it. This … Read more

It is perfectly legal to assign a number to a variable and then assign a string to the same variable as followsexample i = 10; i = “string”; This is called variable typing In JavaScript, variable typing refers to the dynamic typing nature of the language. This means that variables in JavaScript can hold values … Read more

Undefined means a variable has been declared but has not yet been assigned a value. On the other hand, null is an assignment value. It can be assigned to a variable as a representation of no value.Also, undefined and null are two distinct types: undefined is a type itself (undefined) while null is an object. … Read more

Undefined value means the variable used in the code doesnt exist or is not assigned any value or the property doesnt exist. In JavaScript, undefined is a primitive value that is automatically assigned to variables that have been declared but not initialized with a value. It indicates that a variable has been declared but has … Read more