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

Returns all unique values of an array, based on a provided comparator function

Example:

const tips_uniqueElementsBy = (arr, fn) =>
  arr.reduce((acc, v) => {
    if (!acc.some(x => fn(v, x))) acc.push(v);
    return acc;
  }, []);

console.log(tips_uniqueElementsBy(
  [
    { id: 0, value: 'p' },
    { id: 1, value: 'q' },
    { id: 2, value: 'r' },
    { id: 1, value: 's' },
    { id: 0, value: 't' }
  ],
  (a, b) => a.id == b.id
)); 

Output:

[[object Object] {
  id: 0,
  value: "p"
}, [object Object] {
  id: 1,
  value: "q"
}, [object Object] {
  id: 2,
  value: "r"
}]