Coding Help Tips Resources Tutorials
Google Apps Scripts and Web Development Tutorials and Resources by Laurence Svekis
Randomize Array values in place with sort() method in JavaScript Use the sort method in JavaScript, notice the difference in values using a positive one and a negative one value in the return of the anonymous function within the sort parameters. If you use Math random to return randomly a negative or positive value this … Read more
JavaScript Game from scratch Guess the Number learn how to create a JavaScript DOM game Learn how to create a number guessing game with JavaScript. Guess the hidden number, the range will adjust as you guess random numbers. Providing logic for the game play and scoring. <!DOCTYPE html> <html> <head> <title>JavaScript </title> <style> body{ font-style:normal; … Read more
How to create JavaScript code that within one statement can be used to generate a random HEX value to easily change colors to page element background. Click a button change the element background and body background color with JavaScript code. <!DOCTYPE html> <html> <head> <title>JavaScript </title> </head> <body> <div> <input type=”text”><br> <button>Click Me</button> <div class=”results”></div> … Read more
JavaScript Random Math Object to generate Random Numbers with code Code snippet and JavaScript coding lesson how to create Random Numbers with JavaScript code. How to set a minimum and a maximum number for random values, set a range for a random number generator. <!DOCTYPE html> <html> <head> <title>JavaScript </title> </head> <body> <div> <input type=”number”><br> … Read more
Create an email extractor to extract all unique emails from a block of text. This project creates an email extractor which can be used by pasting a block of text into the textarea, then selecting the separator for the output file contents. The unique emails addresses that are retrieved from the text block will be … Read more
JavaScript Regular Expressions and Pattern matching within Strings Email Extract Regexp with match and matchAll() methods 1Use of test() and exec() 3replace() and replaceAll() methods 4search() method 4Find Email Pattern 6Email Extractor Project 8How to create a text file download 12 Regexp with match and matchAll() methods const txtArea = document.querySelector(‘textarea’);const btn = document.querySelector(‘button’);const res … Read more
Regular expressions provide a powerful way to create patterns that can be matched from string content in JavaScript code. To find all matches of a typical email there are several ways to create the pattern. Start by setting up a grouping of the patterns, using the () adding the global flag to match all the … Read more
RegExp with search() methodThe search() method will return a value of the index within the string of the first occurrence that matches the pattern, if no match is found then the result will return a value of -1. You can use the i flag within the regular expression to match on the pattern regardless of … Read more
The replace() method returns a new version of the original string with the pattern matched values being replaced by the new string value. RegExp can be used to set the pattern to be matched, if the pattern is a string value only the first occurrence of the matched results will be replaced. Using a string … Read more
The match() method will return the resulting match of the string value from the regular expression pattern. Depending on if the g flag is used, which is the global flag the results will be returned without the g flag as the first pattern match result including the index value and the string, or with the … Read more