JavaScript: encodeURI() function

encodeURI function

The encodeURI is used to encode a Uniform Resource Identifier (URI) by replacing each instance of certain characters by one, two or three escape sequences representing the UTF-8 encoding of the character.




uri: A complete Uniform Resource Identifier.

The encodeURI function replaces all characters except the following with the appropriate UTF-8 escape sequences:

Type Characters include
Reserved characters ; , / ? : @ & = + $
Unescaped characters alphabetic, decimal digits, - _ . ! ~ * ' ( )
Score #

Example of encodeURI() function

The following web document encodes a specified string using the encodeURI() function.

JavaScript Code:

str1 = "https://www.w3resource.com/javascript tutorial.html";
str2 = encodeURI("https://www.w3resource.com/javascript tutorial.html");
console.log("After using encodeURI function : "+str2);

View the example in the browser

Live demo:

See the Pen encodeURI-function-1 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

semicolon (;)

function nums(a, b) {
  if (a > b) console.log('a is bigger');
  else console.log('b is bigger');
  a + b;

console.log(nums(4, 2));
console.log(nums(1, 2));

In JavaScript, we don't have to write the semicolon (;) explicitly, however the JavaScript engine still adds them after statements. This is called Automatic Semicolon Insertion. A statement can for example be variables, or keywords like throw, return, break, etc.
Here, we wrote a return statement, and another value a + b on a new line. However, since it's a new line, the engine doesn't know that it's actually the value that we wanted to return. Instead, it automatically added a semicolon after return. You could see this as:

a + b;
This means that a + b is never reached, since a function stops running after the return keyword. If no value gets returned, like here, the function returns undefined. Note that there is no automatic insertion after if/else statements!

Ref: https://bit.ly/3jFRBje