Comparison operators in Javascript - Step-by-Step Execution

Concept Flow - Comparison operators

Start

↓

Evaluate Left Value

↓

Evaluate Right Value

↓

Apply Comparison Operator

↓

Result: true or false

↓

Use Result in Condition or Output

↓

End

The program compares two values using a comparison operator and produces true or false as the result.

Execution Sample

Javascript

let a = 5;
let b = 10;
let result = a < b;
console.log(result);

This code compares if 5 is less than 10 and prints the result.

Execution Table

Step	Expression	Evaluation	Result
1	a = 5	Assign 5 to a	a = 5
2	b = 10	Assign 10 to b	b = 10
3	a < b	5 < 10	true
4	result = a < b	result = true	result = true
5	console.log(result)	Print result	true

💡 Program ends after printing true because 5 is less than 10.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 4	Final
a	undefined	5	5	5	5
b	undefined	undefined	10	10	10
result	undefined	undefined	undefined	true	true

Key Moments - 3 Insights

Why does 'a < b' return true even though both are numbers?

'a < b' compares the numeric values of a and b. Since 5 is less than 10, the comparison returns true as shown in step 3 of the execution_table.

What happens if we use '==' instead of '<'?

'==' checks if values are equal. If we used 'a == b', it would return false because 5 is not equal to 10. This is different from '<' which checks order.

Why do we assign the comparison result to 'result'?

Assigning the comparison to 'result' stores the true/false value so we can use it later, like printing it in step 5.

Visual Quiz - 3 Questions

Look at the execution_table, what is the value of 'result' after step 4?

A true

B false

C undefined

D 5

💡 Hint

Check the 'Result' column in row for step 4 in execution_table.

At which step does the comparison 'a < b' get evaluated?

A Step 2

B Step 3

C Step 4

D Step 5

💡 Hint

Look for the step where the expression 'a < b' is evaluated in execution_table.

If we change 'a' to 15, what would be the result of 'a < b' at step 3?

A undefined

B true

C false

D error

💡 Hint

Compare 15 and 10 using '<' operator as shown in step 3 evaluation.

Concept Snapshot

Comparison operators compare two values and return true or false.
Common operators: <, >, <=, >=, ==, !=.
Used to check order or equality.
Result is boolean (true/false).
Example: let result = a < b;
Use result in conditions or output.

Full Transcript

This visual trace shows how comparison operators work in JavaScript. We start by assigning values to variables a and b. Then we compare a and b using the less than operator '<'. The comparison evaluates to true because 5 is less than 10. We store this result in the variable 'result' and print it. The execution table shows each step clearly, and the variable tracker shows how values change. Key moments explain why the comparison returns true and how different operators behave. The quiz tests understanding of the steps and results.