w3resource

JavaScript: decodeURIComponent functions

Description

The decodeURIComponent function is used to decode a Uniform Resource Identifier (URI) component previously created by encodeURIComponent.

Syntax

decodeURIComponent(encodedURI)

Parameters

encodedURI: An encoded component of a Uniform Resource Identifier.

Example of decodeURIComponent() function

In the following web document decodeURIComponent() function is used to decode a Uniform Resource Identifier (URI) component previously created by encodeURIComponent.

JavaScript Code:

url1 = "https://w3resource.com/xyz=http%3A%2F%2Fmyw3r.com%2Fx%3D31%26y%3D21&xyz3=45"; 
//Lets decode url1
console.log(decodeURIComponent(url1));

View the example in the browser

Live demo:

See the Pen decodeURIComponent-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');
  return;
  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:

return;
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