Day 4 of Javascript

This content originally appeared on DEV Community and was authored by Bhuvana Sri R

What is return keyword ?

• The return statement stops the execution of a function and returns a value.
• It used for access the block scope variable outside.

What is BlockLeveScope?

The variable declare inside the block is called bloclevelscope.
It cant’t access the outside of the block.

Example:

function add(a,b)
{
total=a+b;
return total;
}
add(10,20)

What is GlobalLevelScope?

The variable was declare outside of the block.But it access both inside and outside of the block.

Example:

  let total
   function add(a,b)
  {
   total=a+b;
  }
 add(10,20)
  console.log(total)      

How to get UserInput ?

• Using prompt() Method we can get a userInput.
• prompt() is predefined or built-in function.
• It display a dialoge box.
• It return the value as the string formate.
• This dialog box includes a message, a text input field, and OK and Cancel buttons.
• If the user clicks OK after entering text, the prompt() method returns the entered text as a string.
• If the user clicks OK without entering any text, an empty string is returned.
• If the user clicks Cancel or closes the dialog box, null is returned. Example:

let a=prompt("enter the value")
if(a>=18)
{
console.log("Eligible for vote")
}
else
{
console.log("not Eligible for vote")
}

This content originally appeared on DEV Community and was authored by Bhuvana Sri R