You can also add (or concatenate) two or more strings together. Let e = "Citation says, "it will break", and I agree." This is NOT safe - using the same, unescaped, strings Let c = "He said, \"this will be fun\", few hours later." This is safe - correctly escaped string This is safe - using different strings Otherwise, JavaScript will think that quote ends the string. If you create a string with single quotes you can use single quote characters inside the string only if you escape it with slash (\' or (\")). Whatever is there between the quotes, JavaScript will treat it as a piece of text. In some sense, string can contain any other data types. Between the quotes can be almost anything, characters, numbers, etc. A string is something surrounded by either single or double quotes. It is also one of the most commonly used data types. In JavaScript, there are currently eight data types. In some cases, this applies not only to values but also to variables. Data types are basically a classification, or an attribute, that says what kind of data specific value can have. Data typesĭata types are fundamental blocks of every programming language. JavaScript Basics – Understanding Basic JavaScript Data Types Part 2. It will help you understand how these data types work and how you can use them.
This article will help you learn all you need to know about the first two, strings and numbers.
Basic data types in javascript how to#
These data types are essential for storing and manipulating data in JavaScript, and you’ll use them frequently in your code.īy understanding these data types and how to use them, you’ll be well on your way to writing effective JavaScript code.Data types are one of the things every JavaScript and developer, and web developer, should know. In this tutorial, we covered the basic data types in JavaScript: numbers, strings, booleans, and null/undefined. Note that undefined is a value that is automatically assigned to a variable that has been declared but not yet assigned a value. Here’s an example: let x = null // null value They are often used as placeholders or default values. Null and undefined in JavaScript are used to represent absence of a value. You can use comparison operators like =, !=,, = to compare values and return boolean results. They are created using the true and false keywords. Let fullName = firstName + " " + lastName // fullName = "John Doe"īooleans in JavaScript are used to represent true/false values. Here’s an example: let firstName = "John" You can concatenate (join) strings using the + operator. Here are some examples: let name = "John" They are created by enclosing text in single or double quotes. Strings in JavaScript are used to represent text. You can perform mathematical operations on numbers using arithmetic operators like +, -, *, and /. Here are some examples: let x = 10 // integer They can be integers (whole numbers) or floats (numbers with decimal places). Numbers in JavaScript are used to represent numerical values. In this tutorial, we’ll walk you through each of these data types and how to use them in your JavaScript code. These include numbers, strings, booleans, and null/undefined. In JavaScript, there are several basic data types that are used to store and manipulate data.
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