Is it necessary to explicitly set the variable type in TypeScript when it is inferred correctly? For example:
const add = (a: number, b: number) => a + b;
const result = add(2, 3);
// Or should I explicitly declare the return value type?
const add = (a: number, b: number): number => a + b;
const result = add(2, 3);
I understand that type inference covers many scenarios. If not considered bad practice, are there any instances where explicit types are preferred?
When considering the suitable moment to include explicit types in code, it is important to acknowledge that this decision can vary based on personal preferences. While not mandatory in cases where type inference is possible, there are both advantages and disadvantages to implementing explicit types:
Downsides:
Upsides:
In my opinion, while simple functions may not necessitate explicit types (such as basic lambda functions with a single return value), they are immensely beneficial for complex functions with multiple return statements. Given that functions tend to grow in complexity over time, I lean towards incorporating explicit return types in functions for long-term maintainability.
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