TypeScript custom Error Handling example

TypeScript Error Handling : Exercise-2 with Solution

Write a TypeScript function that calls a non-existent function. Use a try-catch block to catch the resulting error and display a custom error message.

Sample Solution:

TypeScript Code:

function callNonExistentFunction(): void {
  try {
    // Attempt to call a non-existent function
    nonExistentFunction();
  } catch (error) {
    console.error("Custom Error: The function does not exist.");
  }
}

// Call the function
callNonExistentFunction();

Explanations:

In the exercise above -

• The "callNonExistentFunction()" function tries to call a non-existent function nonExistentFunction().
• Inside the try block, the code attempts to call the non-existent function, which will result in a runtime error.
• If an error occurs, the catch block catches the error, and a custom error message is displayed using console.error.

Output:

"Custom Error: The function does not exist."

TypeScript Editor:

See the Pen TypeScript by w3resource (@w3resource) on CodePen.

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