Today I learned about conditional statements in JavaScript. These statements are the building blocks for decision-making in any program. I understood how we can control the flow of the program based on certain conditions using if, else, else if, and even nested if blocks.
What is a Conditional Statement?
Conditional statements let the program decide what to do next based on whether a condition is true or false.
In JavaScript, we use these:
- if – checks a condition and runs the code if it’s true
- else – runs when the if condition is false
- else if – checks multiple conditions in order
- nested if – an if inside another if, used for complex logic
Flowchart: How Conditional Statements Work
[Start] | [Condition] / \ True False / \ [If block] [Else block] | [Else if block] (optional) | [End] Problem I Solved: Grade Calculator
Problem Statement:
Write a program to accept a student’s mark and print the grade based on the mark.
Code:
let marks = 85; if (marks >= 90) { console.log("Grade A"); } else if (marks >= 80) { console.log("Grade B"); } else if (marks >= 70) { console.log("Grade C"); } else if (marks >= 60) { console.log("Grade D"); } else { console.log("Grade F"); } 
- The program checks one condition at a time.
- Once a condition is true, it prints the corresponding grade and stops checking further.
- If none match, it goes to the final else block (Grade F).
Ask Yourself: What Are the Alternatives?
Can you solve the same problem using any of these?
- Ternary Operator
- switch(true) statement
- Function-based logic
- Nested if
Challenge for You:
Try rewriting this same grade logic using one of the above methods and see which is shorter or easier to understand!
What I Learned
Conditional statements help in making programs dynamic and responsive. Whether it's grading students, checking login info, or greeting users based on time — they are used everywhere. I’ll keep practicing to get more confident with different structures.
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