By Lenny Burdette
JavaScript is an object-oriented scripting language that permits you to change a document's constitution, styling, and content material based on consumer activities. this useful pocket serves as either a short creation to the language and acts a worthwhile reference. It's jam-packed with counsel in addition to JavaScript syntax, equipment, and houses. Concise and cheap, it's precisely the advisor many internet designers and builders desire.
Read Online or Download The JavaScript Pocket Guide (Peachpit Pocket Guide) PDF
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Extra resources for The JavaScript Pocket Guide (Peachpit Pocket Guide)
Sample text
A JavaScript identifier is a word that contains only letters, numbers, $, and _, and that doesn’t start with a number. Variables are a great demonstration of how statements and expressions can be combined. You use a variable declaration statement to create a variable. var myVariable; If you already have a variable, you can use a variable assignment expression to assign it a value. myVariable = 42; 42 You can combine a variable declaration with an assignment expression. var myVariable = 42; You can also string together several variable declarations with commas.
Log(sideC); 5 In JavaScript, functions are just another data type, so you can assign a function to a variable. Chapter 1: JavaScript Basics 9 var myFunc = function() { return 42; }; typeof myFunc; "function" myFunc(); 42 Functions are also an incredibly useful tool for organizing your code and acting upon values. You’ll use them throughout the first few chapters before exploring them in more depth in Chapter 5. Objects Objects are so fundamental to JavaScript that it is considered an objectoriented language.
Var myString = "hello world"; // If the string does *not* contain the substring: if (! log("String contains 'hello'"); } In the first example of the previous code, indexOf() doesn’t find the substring and returns -1, which is a “truthy” value. ) operator, it does the opposite of what I expect. In the second example of the previous code, indexOf() finds the substring at position 0, which is a “falsey” value. Because the substring is the start of myString, this test also does the opposite of what I expect.
