Salesforce JavaScript Developer I Certification 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which of the following is a correct way to declare a constant in JavaScript?

const myConstant = 10;

Declaring a constant in JavaScript is achieved using the `const` keyword. This denotes that the variable being declared cannot be re-assigned after its initial value is set. In the case of the provided example, `const myConstant = 10;` correctly creates a constant named `myConstant` with a value of 10.

Using `const` provides the benefit of ensuring that the value remains fixed, which can help prevent accidental changes to the variable later in the code. It establishes a clear intent that this particular variable is meant to remain constant throughout its scope.

The other options present different variable declaration keywords. The use of `constant` is not a valid JavaScript keyword; `let` allows for re-assignment of the variable, making it unsuitable for constants; and `var` is an older way of declaring variables that’s function scoped instead of block scoped, which does not inherently prevent re-assignment. Thus, these other methods do not fulfill the requirement to declare a constant.

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constant myConstant = 10;

let myConstant = 10;

var myConstant = 10;

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