CompTIA PenTest+ Practice Test

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In JavaScript, how do you declare and assign a variable?

var my_str "Hello, World!";
my_str = "Hello, World!";
var my_str = "Hello, World!";
my_str: "Hello, World!";

The correct answer is: var my_str = "Hello, World!";

In JavaScript, variables can be declared and assigned values using the `var`, `let`, or `const` keywords, followed by the variable name, an equals sign (`=`), and the value being assigned. The correct way to declare and assign a variable is demonstrated by using the `var` keyword, which allows you to create a variable that can be re-assigned later. In the given example, `var my_str = "Hello, World!";` correctly declares a variable called `my_str` and assigns it the string value "Hello, World!". This syntax conforms to JavaScript rules for variable declaration and assignment. Using `var` provides function scope for the variable in older versions of JavaScript, while newer alternatives like `let` and `const` offer block scope. Regardless, option C illustrates the fundamental structure for variable declaration and assignment in JavaScript, making it the appropriate choice in this context.