else if in JavaScript?

Question

What is the purpose of adding else if in JS if you have a better option (switch)?

Answer 1

Use switch instead of if when:

1- You are comparing multiple possible conditions of an expression and the expression itself is non-trivial.
2- You have multiple values that may require the same code.
3- You have some values that will require essentially all of another value's execution, plus only a few statements.

Use if instead of switch when:

1- You want to test for the truthiness of an expression.
2-You only have a single affirmative test.
3-You need to evaluate different expressions for each branch.