Monthly Archives: January 2022

INTRODUCTION TO JAVASCRIPT Javascript is a scripting language, single thread, conforming to the ECMAScript specification that can operate both client-side and server-side and is compiled and interpreted. A scripting language is a language that needs to be executed within a pre-existing entity in order to operate. In the case of javascript, the entity is the web browser. Single Thread. Imagine a post office with a single operator who has to serve n customers. What the operator can do however fast is to serve one person at a time. People in the queue must wait for the [...]

JAVASCRIPT OUTPUT We introduce the "Output in Javascript" argument by saying that JavaScript can "display" data in several ways: Write in an HTML element, using innerHTML Write to the HTML output using document.write () Write to an alert window, using window.alert () By writing to the browser console, using console.log () INNERHTML To access an HTML element, JavaScript can use the document.getElementById(id) method. The id attribute defines the HTML element. The innerHTML property defines the HTML content. OUTPUT IN JAVASCRIPT THE METHOD DOCUMENT.WRITE For testing purposes, it is convenient to use document.write(). Using document.write () after [...]

JAVASCRIPT STATEMENT In this post we will discuss variables declared can var or let while also taking a look at the nomenclature commonly used by programmers for variable naming. Let us introduce the topic regarding the "Javascript syntax" by talking first about statements (instructions). let a, b, c; // Statement 1 a = 5; // Statement 2 b = 6; // Statement 3 c = a + b; // Statement 4 The statement (instruction) let a, b, c declares three variables. A program is a list of "statements" that are to be "executed" by a computer. In HTML, JavaScript [...]

VALUES AND VARIABLES IN JAVASCRIPT In this introductory part, some concepts are repeated. It is useful to fix well what are the basic elements of language. Values are fundamental units of any program. To understand what a value is, let's take a culinary example. To make a dish we need various ingredients that properly combined together provide us with the desired dish. Similarly in javascript we need a whole set of information units which are the values, without the values it is as if we want to prepare that delicious dish but without having the ingredients available. VARIABLES The [...]

JAVASCRIPT OPERATORS Before we begin, let us understand the terminology. An operand - is what the operator applies to. For example, in multiplication 5 * 2 there are two operands: the left operand is the number 5, and the right operand is the number 2. Sometimes operands are also called "arguments." An operator is unary if it has a single operand. For example, negation-reverses the sign of a number: let x = 1; x = -x;alert( x ); // -1, unary negation is applied An operator is binary if it has two operands. The same "minus" operator exists in [...]