Conditionals

Mission: Decision Desk

This section teaches a script to choose between outcomes. Keep the work in script.js and check results in the Console.

Conditional statements let your program make decisions. score >= 90 asks whether a number is at least 90 and yields true or false. JavaScript tests branches from top to bottom; only the first matching branch runs. Put the highest threshold first so 95 does not get classified by a lower one.

Syntax

if (condition) {
    // runs when condition is true
} else if (anotherCondition) {
    // runs when first was false but this is true
} else {
    // runs when none of the above matched
}

A named calculation

The task asks for a function even though the dedicated Functions module comes next. For now, read function name(input) { ... } as a reusable calculation: the input takes a different value on each call, and return sends back its result. This separate example uses a different rule:

function accessLevel(age) {
  if (age >= 18) return "adult";
  return "minor";
}
console.log(accessLevel(20)); // adult

Use the same function shape to classify scores, but use else if for the intermediate grade thresholds. The shorthand ? : appears later; you do not need it here.