1^// Start at the beginning2[_a-zA-Z0-9-]// Define a group3+// One or more times4(// Group 15\.// a "real" dot6[_a-zA-Z0-9-]// Another group7+// One or more times8)// /* End group 1 */9*// Group optional or multiple times10@// The @ character11[a-zA-Z0-...
function updates the histogram with the letters of text.add(text) {// Remove whitespace from the text, and convert to upper casetext = text.replace(/\s/g, "").toUpperCase();// Now loop through the characters of the textfor(let character of text) {let count = this.letterCounts.get(ch...
functiongetSymbols(string){varlength = string.length;varindex =-1;varoutput = [];varcharacter;varcharCode;while(++index < length) { character = string.charAt(index); charCode = character.charCodeAt(0);if(charCode >=0xD800&& charCode <=0xDBFF) { output.push(character + string.charAt(++index...
If you are a beginner, you can use these notes to get a deeper dive into JavaScript. I hope these notes will motivate you to spend more time reading the specification. If you are a professional developer, you can consider these examples as a great reference for all of the quirks and une...
can affect the outcome of your code. We’ll not only explain how it works, but also provide solutions and best practices to avoid these gotchas and write predictable, efficient JavaScript code. So, buckle up and get ready to master the power (and potential perils) of short-circuit ...
ascii_only (default: false)— escape Unicode characters in strings and regexps (affects directives with non-ascii characters becoming invalid) beautify (default: true)— whether to actually beautify the output. Passing -b will set this to true. Use -O if you want to generate minified code an...
// Functions are parameterized blocks of JavaScript code that we can invoke.functionplus1(x){// Define a function named "plus1" with parameter "x"returnx+1;// Return a value one larger than the value passed in}// Functions are enclosed in curly bracesplus1(y)// => 4: y is 3, ...
Strings, that are sequences of characters, are, in other words, sequences of these numbers. Now there are numerous character sets known and even currently used across computers, each with its own legacy. ASCII, clearly one of the most popular character sets known to date, goes back to the...
ascii_only (default: false)— escape Unicode characters in strings and regexps (affects directives with non-ascii characters becoming invalid) beautify (default: true)— whether to actually beautify the output. Passing -b will set this to true. Use -O if you want to generate minified code an...
As such, when you have a character that uses more than 2 bytes, JavaScript will report its length incorrectly. For example: this is really, really wrong:"💩".length === 2. Likewise, you can't rely onString.prototype.split()for anything other than simple ascii characters. Don't believe...