How do you find a character in a string, using JavaScript?

You have one easy way.

Every string has an includes() method that accepts one (or more) characters.

This method returns true if the string contains the character, and false if not:

'a nice string'.includes('a') //true
'a nice string'.includes('b') //false

If you need to find the exact position of the letter in the string, however, you need to use the indexOf() method:

'a nice string'.indexOf('a') //0
'a nice string'.indexOf('c') //4

If there are more than one occurrence, this method returns the position of the first one it finds, starting from the left.