Logic Visualizer

Understanding the isEven Function in JavaScript

This analysis details the JavaScript function `isEven`, which checks if a number is even using the modulus operator. It includes a flowchart, pseudocode representation, and annotations for enhanced clarity, making the logic accessible to


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Prompt

// What is the logical flow of this function?
function isEven(num) {
 return num % 2 === 0;
}

console.log(isEven(4)); // true
console.log(isEven(5)); // false

Answer

Text Explanation Analysis

The provided JavaScript code defines a function isEven that checks whether a given number is even. It uses the modulus operator % to determine if the remainder of the division of num by 2 is zero. If the remainder is zero, the function returns true, indicating the number is even, otherwise, it returns false.

The code also includes two test cases where the function is called with the arguments 4 and 5.

Visual Representation Development

Below is the visual representation of the given JavaScript function isEven, illustrating its logic with a flowchart and pseudocode.

Flowchart

  Start
    |
    v
Input Number (num)
    |
    v
Calculate num % 2
    |
    v
Is the remainder 0?
   /  \
Yes (✔) No (✘)
  |      |
  v      v
Return True  Return False
    |         |
    v         v
 End        End

Pseudocode

DEFINE FUNCTION isEven(num)

  IF num % 2 EQUALS 0 THEN
    RETURN True
  ELSE
    RETURN False
  END IF

END FUNCTION

CALL console.log(isEven(4)) // Expected output: true
CALL console.log(isEven(5)) // Expected output: false

Enhanced Clarity through Annotations

Annotations for Pseudocode

  1. DEFINE FUNCTION isEven(num): Start the function definition isEven with parameter num.
  2. IF num % 2 EQUALS 0 THEN: Check if the number num is divisible by 2 (num % 2 === 0).
  3. RETURN True: If the condition is true, return true, indicating num is even.
  4. RETURN False: If the condition is false, return false, indicating num is not even.
  5. CALL console.log(isEven(4)): Output the result of isEven(4) to the console; should be true.
  6. CALL console.log(isEven(5)): Output the result of isEven(5) to the console; should be false.

This visual and annotated breakdown allows anyone, regardless of technical expertise, to understand the flow and logic of the code clearly.

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Description

This analysis details the JavaScript function isEven, which checks if a number is even using the modulus operator. It includes a flowchart, pseudocode representation, and annotations for enhanced clarity, making the logic accessible to all skill levels.

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