Easy - 11 - AB Check.js

// Step By Step
function ABCheck(str) {

    // First, we declare two regex expressions to match if a and b ever occur three characters apart.
    // Note that . is a "wildcard" metacharacter in regex that matches almost any character.
    var testOne = /a...b/;
    var testTwo = /b...a/;

    // Next, we use the test method in conjunction with the regex expressions to see if our string contains any matching characters
    var aThenB = testOne.test(str);
    var bThenA = testTwo.test(str);

    // Finally, we return our answer
    return aThenB || bThenA;
}

// Best Practices
function ABCheck(str) {

    return (/a...b/).test(str) || (/b...a/).test(str);
}