Javascript
Global

For parseInt, parseFloat, see String.tryParseInt and String.tryParseDouble respectively.

console.log

The console.log() function is used to print messages to the console. It can be used for debugging purposes or to display information.

Example:

console.log("Hello, World!"); // Output: Hello, World!

regexp.test

The regexp.test() function is used to test if a given string matches a regular expression pattern. It returns true if the string matches the pattern, and false otherwise.

Example:

var pattern = /hello/;
var str = "Hello, World!";
console.log(pattern.test(str)); // Output: false
str = "hello, how are you?";
console.log(pattern.test(str)); // Output: true

btoa

The btoa() function is used to encode a string in base64 format. It takes a string as input and returns a base64 encoded string.

Example:

var str = "Hello, World!";
console.log(btoa(str)); // Output: SGVsbG8sIFdvcmxkIQ==

atob

The atob() function is used to decode a base64 encoded string. It takes a base64 encoded string as input and returns the decoded string.

Example:

var base64Str = "SGVsbG8sIFdvcmxkIQ==";
console.log(atob(base64Str)); // Output: Hello, World!

encodeURIComponent

The encodeURIComponent(str) function encodes a URI component by escaping all characters except alphabetic characters, decimal digits, and a few special characters (-, _, ., !, ~, *, ', (, )). It is used to encode the values of query string parameters to ensure special characters do not interfere with the way the URI is interpreted by browsers and servers. For example, it encodes spaces as %20 and = as %3D. Detailed documentation (opens in a new tab)

Example:

var myParam = 'This & That';
var encodedParam = encodeURIComponent(myParam);
console.log(encodedParam); // Outputs: This%20%26%20That

decodeURIComponent

decodeURIComponent(str) function decodes a URI component previously created by encodeURIComponent or by a similar routine. It reverses the encoding process by replacing percent-encoded characters with their corresponding ASCII characters. Detailed documentation (opens in a new tab)

Example:

var decodedParam = decodeURIComponent(encodedParam);
console.log(decodedParam); // Outputs: This & That

encodeURI

encodeURI(uri): Unlike encodeURIComponent, this function is intended to encode a complete URI without escaping characters that have special meanings in URIs (like :, /, ?, &, =). It encodes the necessary components of the URI to make it safe for transmission by escaping all characters except those considered safe. Detailed documentation (opens in a new tab)

Example:

var uri = 'https://mozilla.org/?x=шеллы';
var encoded = encodeURI(uri);
console.log(encoded);
// Expected output: "https://mozilla.org/?x=%D1%88%D0%B5%D0%BB%D0%BB%D1%8B"

decodeURI

decodeURI(encodedURI): This function is used to decode a URI that was previously encoded using encodeURI. It decodes the entire URI but will not decode characters that are part of the URI syntax itself (like ? and # in query strings and fragments). Detailed documentation (opens in a new tab)

Example:

var uri = 'https://mozilla.org/?x=шеллы';
var encoded = encodeURI(uri);
console.log(encoded);
// Expected output: "https://mozilla.org/?x=%D1%88%D0%B5%D0%BB%D0%BB%D1%8B"
 
console.log(decodeURI(encoded));
// Expected output: "https://mozilla.org/?x=шеллы"
ExceptionsGlobal Scripts