- HTML Supported
- Good for web browsers
- Lightweight and high efficiency
- Interpreted Programming Language
- Fully controlled browsing
- Scripting language
- Object-Oriented based language
- Within scripts New function creating language
What is the function of an operator?
What is an anonymous function?
An anonymous function is a function having no name and it’s the argument about other functions. Such functions are helpful to save from name collisions.
This is the passed argument and it’s a function in this language and it passes to another function. Because of this callback function can take another. The basic reason for this function is to execute code in response to an event.
What is negative infinity?
It’s the fixed value which shows the available lowest value. It means there is no smaller value than it. It can be formulated by dividing a negative number just by zero.
What’s the difference between undeclared and undefined variables?
Undeclared variables are simply those which are not declared in the program and if the program captures and tries to read it then automatically, a runtime error appears.
Undefined variables are the variable that is declared in any program but they are not assigned any value or number. If the program captures and tries to read it then automatically, the undefined value is returned.
In all browsers like Mozilla, Firefox, and Chrome, etc. have built-in debugger which stops the execution and performs the debugging function. Normally, by using the F12 key you can generate the debugger and it replicated the function of breakpoints. But make sure your debugging setting must be enabled in browser settings.
What is a prompt box?
A prompt box is used to enter the inputs by users. This input is provided by a text box.
What is “this” keyword?
Keyword “This” is a reference variable that refers to something. It avoids the conflicts of naming in the object method.
During the running of the program, a timer is used to execute the program at a given specific time. This process is done by SetTimout and SetIntercal functions.
A comment is used to give additional information about your program.
What is a multi-line Comment?
Multiline comments are used for the description of code and compilers ignore these comments.
This is the symbol for single line //
Variables and functions are moved into the hoisting process. These are moved according to their top of the scope.
What is the Strict mode or mistake reducer mode?
What is == operator?
== it’s called equality operator and it gives true response when the operands have equal value.
What does the !! operator do?
This operator simply converts the value into Boolean.
Discuss what’s an automatic type of conversation?
- Do while
What is the difference between the confirmation box and the alert box?
Ok, and the cancel button is showed by confirmation box while on the other side, only Ok button is showed.
What is Scope?
- Global Scope
- Functional Scope
- Block Scope
What is a closure?
Boolean shows the values in two stances; either true or false. The boolean object can be created by Boolean constructor.
function display ( )
Cookies are small files that are created when we visit different sites and these cookies store the username and other shopping details as well.
- Logical Errors
- Loading Errors
- Run time errors.