What Is a Condition?

A Condition is a simple test that helps a program make decisions depending on certain conditions. Conditional statements and conditional control structures allow different behaviors, so a program can act in a way that changes with each result. For example, whether it is raining outside affects the action, like bring an umbrella; Otherwise, the program can allow a different action. This reasoning mimics how humans look at a situation and bring responses that fit certain facts, although computer reasoning follows predefined rules rather than human judgment. Intuitively, conditions compare values and produce results that control program flow.

Why Do We Need Conditionals?

Conditionals work exactly how real programs need to respond to different situations, instead of letting code run the same way every single time. A game needs to know if a player won or lost, because each result causes a different action. A website needs to know if a user is logged in or not logged, and Else it shows different content or access. Think about a traffic light: green means go, yellow means slow down, and red means stop, which shows how condition-based decisions change actions.

Conditions

What Are If Statements?

A conditional is an if statement. The if keyword starts the basic structure, and the condition is an expression in parentheses that returns true/false. The if statement runs code only when the condition is true, and the block is skipped when it is false. Example: if (score >= 70) { print(“Pass”); }

How Does Adding Else Work?

The else part runs when the condition false result occurs, so the program does something different. Example: if (score >= 70) { print(“Pass”); } else { print(“Fail”); }

How Do Multiple Else If Statements Work?

Else if checks additional conditions when you want more than two possibilities. Conditions are checked from top to bottom in order; once one is true, the rest are skipped, so order matters. Example: if (score >= 90) { print(“A”); } else if (score >= 70) { print(“B”); } else { print(“Fail”); } If scores of 90+ get C incorrectly, the first check is wrong because the condition order is incorrect.

How Can You Combine Conditions?

Conditions support combine operations using logical operators to test multiple rules in one expression. Example: if (age >= 18 && hasID) { print(“Enter”); }

What Are Nested Conditionals?

Conditionals can exist inside other conditionals for complex decisions that put one test within another. Example: if (loggedIn) { if (isAdmin) { print(“Admin”); } }

What Is the Ternary Operator

The Ternary operator is called shorthand for simple if/else statements.

When Is It Used?

Ternary Use includes true/false assignments and inline decisions when the code fits one line. Example: let status = age >= 18 ? “Adult” : “Child”;

When You Avoid the Ternary Operator

Ternary NOT Use applies to Complex conditions or Multiple statements because this hurts readability.

What Are Truthy and Falsy Values?

JavaScript treats truthy and falsy values; truthy values act like true, while falsy values act like false. Example: if (“hello”) { print(“Runs”); } because the string is truthy.

What Are the Key Takeaways?

• if runs code when the condition is true.
• else runs code when the if condition is false.
• else if checks additional conditions before selecting a result.
• Conditions are checked in order, and the first true condition wins.
• &&, ||, and ! combine conditions to evaluate multiple tests in one expression.
• The ternary operator is shorthand for simple if/else expressions and supports short conditional assignments.