1/11/2024 0 Comments Deep equl eloquent javascriptYou can bind names to expressions, and use the names later, for example:Ĭonst dozen = 3 * 4 // Binds the name dozen to the value 12 There are some occasions where a TypeError occurs, such as using a symbol where a number or string is expected, trying to access a property on null or undefined, and mixing numbers with bigints. ![]() JavaScript isn’t 100% weakly-typed though Wordcount.mjs import readline from 'readline/promises'Ĭonst reader = readline.createInterface(process.stdin)įor (let of line.toLowerCase().matchAll(/[\p. These tools will manage your program files and host your applications for you. If you want to build programs that anyone can run on the web, there are many, many options, including CodeSandbox, Glitch, The p5.js Web Editor, CodePen, and Replit to name a few. The console is wonderful for trying things out yourself, but you’re probably here to learn how to write programs for people to use. Ohai! You made it back! That program blew away this page that you were looking at, didn’t it? Don’t do that again. Run this code from the console:ĭ = "Hello, world." The document’s body can show either plain text (through its textContent property) or beautiful structured content (through its innerHTML property). You normally want to write to the browser’s document. The browser’s console is not the main show: on the web, the console is generally used only for informative messages and error messages. At the prompt, enter and run the one-line program: You can run JavaScript programs (scripts) from the command line or directly within a web browser.įind your browser’s “Developer Tools” and go to the “Console” tab. The One Clear Path to Learning JavaScript, according to Eric Elliott.Marijn Haverbeke’s Eloquent JavaScript book.A lot of the code in the wild, and a lot of the code you see online and in books, is quite old and may not follow modern best practices. Although over 25 years old, JavaScript is still an evolving language. The language was originally named Mocha, then was renamed LiveScript in September, 1995, and then renamed JavaScript sometime after that. ![]() The first implementation was written by Brendan Eich in 10 days in May of 1995.
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