w3resource

JavaScript: decodeURI function

Description

The decodeURI is used to decode a Uniform Resource Identifier (URI), previously created by encodeURI or by a similar routine.

Syntax

decodeURI(encodedURI)

Parameters

encodedURI: A complete, encoded Uniform Resource Identifier.

Example of decodeURI Functions

The following web document decode a specified string using the decodeURI() function. The string was previously encoded by encodeURI() function.

JavaScript Code:


str1 = "https://www.w3resource.com/javascript%20tutorial.html";
console.log(str1);
str2 = decodeURI("https://www.w3resource.com/javascript tutorial.html");
console.log("After using decodeURI function : "+str2);

View the example in the browser

Live demo:

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


Previous: JavaScript: encodeURI() function
Next: JavaScript: encodeURIComponent functions



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