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Can you identify and correct it?function greet(name: string) { console.log("Hello, " + name);}greet(123);What is the error, and how would you correct it?

Question

Can you identify and correct it?

function greet(name: string) {
    console.log("Hello, " + name);
}
greet(123);

What is the error, and how would you correct it?

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Solution

Identifying the Error

  1. Type Mismatch: The function greet is defined to take a parameter of type string, but it is being called with a number (123).
  2. TypeScript Strictness: TypeScript checks types at compile time, and passing a number to a function that expects a string will throw an error.

Correcting the Error

  1. Change the Argument: The simplest correction is to ensure that the argument passed to the function is of type string. You can change the call from greet(123); to greet("123");.

    function greet(name: string) {
        console.log("Hello, " + name);
    }
    greet("123"); // Corrected call with string argument
    
  2. Type Conversion: Alternatively, if you want to allow numbers and convert them to strings inside the function, you can modify the function to accept a parameter of type any or number, and then cast it to a string.

    function greet(name: any) {
        console.log("Hello, " + String(name)); // Converting to string
    }
    greet(123); // This will now work correctly
    

Summary

The initial call greet(123); produces a type error due to the mismatch in expected parameter type. By passing a string or modifying the function to accept numbers, the error can be resolved effectively.

This problem has been solved

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