freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-javascript/chaining-if-else-statements/index.md

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Chaining If Else Statements

Chaining If Else Statements

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Problem Explanation

• If: the first conditional in every if/else statement, case the conditional is true, execute the code and ignore the rest.
• Else if: can never be used as the first conditional. It is always a conditional after an if, case the conditional is true, execute the code. Otherwise jumps into the next conditional.
• Else: case all the previous conditionals are false, else is executed.

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Hints

Hint 1

Remember that you can combine (chain) several if...else statements one after the other until your last one using else if (condition) {do this}.

Hint 2

Sometimes, when you write more code than you are used to and it doesn't work, the little things are what betray us. Checking for missing semicolons, brackets, etc. can prove very useful.

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Solutions

Solution 1 (Click to Show/Hide)

function testSize(num) {
  // Only change code below this line
  if (num < 5) {
    return "Tiny";
  } else if (num < 10) {
    return "Small";
  } else if (num < 15) {
    return "Medium";
  } else if (num < 20) {
    return "Large";
  } else {
    return "Huge";
  }
  // Only change code above this line
}

Code Explanation

The function first checks the if condition (num < 5). If it evaluates to true, it returns the statement between the curly braces ("Tiny"). If it doesn't, it checks the next condition until the last else statement.

Relevant Links

• "if...else" - MDN JavaScript reference