# 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'`

.