Write a boolean expression to test whether a variable, country, is equal to “China” or “New Zealand”

Write a boolean expression to test whether a variable, country, is equal to “China” or “New Zealand”.

The correct answer and explanation is:

The boolean expression to test whether a variable, country, is equal to “China” or “New Zealand” is:

(country === "China" || country === "New Zealand")

Explanation:

1. Boolean Expressions: A boolean expression evaluates to either true or false. It is commonly used in conditional statements like if to control the flow of execution depending on certain conditions.
2. Equality Operators: In JavaScript, the === operator is used to check if two values are strictly equal. This means that both the value and the type of the variables being compared must be the same. For instance, "China" === "China" would return true, but "China" === 123 would return false since one is a string and the other is a number.
3. Logical OR (||) Operator: The || (OR) operator is used to combine two boolean expressions. If either of the two expressions evaluates to true, the entire expression will return true. In this case, it checks whether country is either equal to “China” or equal to “New Zealand”. If either condition is true, the overall expression evaluates to true. If both are false, it returns false.
4. Application of the Expression: In the expression (country === "China" || country === "New Zealand"), it checks if the country variable holds the value “China” or “New Zealand”. If either of these values matches the content of country, the result will be true, meaning the country is either “China” or “New Zealand”. If neither of these values match, the result will be false, meaning the country is neither of these two.
5. Why Use === Over ==: The === operator is preferred because it checks both value and type, ensuring that no type coercion occurs, unlike the == operator, which may perform type conversion and lead to unexpected results.

This expression can be used in various programming contexts, including conditional statements, loops, and functions, to control program flow based on the value of the country variable.