figure out in javascript

To figure something out in JavaScript, the following steps can be helpful:

  1. Define the problem: Identify the requirements and constraints of the problem. Break the big problem into smaller, more manageable sub-problems.
index.tsx
// Defining a problem
// Create a function to check if a given number is even or odd

function isEven(num) {
   // code to check if the number is even
}

isEven(5); // Should return false
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  1. Plan the solution: Develop a plan to solve the sub-problems. This may involve writing pseudocode or drawing diagrams.
index.tsx
// Plan the solution
// Create a function to check if a given number is even or odd

// 1. Define a function to take in a number as a parameter
function isEven(num) {
   // 2. Check if the number is even by using the modulo operator
   if (num % 2 === 0) {
      return true;  // 3a. If the number is even, return true
   } else {
      return false; // 3b. If the number is odd, return false
   }
}

isEven(5); // Should return false
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  1. Code the solution: Write the code based on the plan. Test the code to see if it works as expected.
index.tsx
// Code the solution
// Create a function to check if a given number is even or odd

function isEven(num) {
   if (num % 2 === 0) {
      return true;
   } else {
      return false;
   }
}

isEven(5); // false
isEven(2); // true
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  1. Test the solution: Test the code with different inputs and edge cases to ensure it works as expected. Debug and refine the solution as necessary.
index.tsx
// Test the solution
// Create a function to check if a given number is even or odd

function isEven(num) {
   if (num % 2 === 0) {
      return true;
   } else {
      return false;
   }
}

console.log(isEven(5)); // false
console.log(isEven(2)); // true
console.log(isEven("hello")); // false (edge case)
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  1. Maintain the solution: Maintain the code by updating it as the requirements and constraints change. Refactor the code to make it more efficient or readable as necessary.
index.tsx
// Maintain the solution
// Create a function to check if a given number is even or odd

function isEven(num) {
   if (typeof num === "number") {      // Edge case: check if the input is a number
      return num % 2 === 0;
   } else {
      return false;
   }
}

console.log(isEven(5)); // false
console.log(isEven(2)); // true
console.log(isEven("hello")); // false (edge case)
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