What are some examples of type inference errors in programming?

What are some examples of type inference errors in programming?

Type inference errors occur when the compiler cannot determine the type of a variable. For example, in JavaScript, if you try to perform arithmetic on a string and a number, it may lead to unexpected results.

Can you give me a specific code example?

Sure! In TypeScript, if you declare a variable without an explicit type and then assign it a value that changes type, like this:

let value;
value = 5; // inferred as number
value = 'hello'; // now inferred as string

This can lead to type errors later in the code.

What are the consequences of these errors?

Consequences include runtime errors, unexpected behavior, and difficulty in debugging, as the code may not behave as intended.

How can I avoid type inference errors?

To avoid type inference errors, always declare variable types explicitly, use strict mode in TypeScript, and leverage type-checking tools.