# Practical usage of if-else conditions in JavaScript

The variable `month` contains some number in the interval from `1` to `12`. Determine what time of the year this month falls (winter, summer, spring, autumn).

Given a string consisting of characters, for example, `'abcde'`. Check that the first character of this string is the letter `'a'`. If so, print `'yes'`, otherwise print `'no'`.

A number is given, for example, `12345`. Check that the first character of this number is `1`, `2` or `3`. If so, print `'yes'`, otherwise print `'no'`.

Given a three-digit number. Find the sum of the digits of this number.

Given a `6`-digit number. Check that the sum of the first three digits is equal to the sum of the second three digits. If so, print `'yes'`, otherwise print `'no'`.

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