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mob-coding-challenge.js

// If we all shook each others' hands once (and only once),
// how many handshakes would that be??
// Write a function that calculates how many handshakes will
// occur for a given number of people.

function countHandshakes (numPeople) {
    var total_count = 0;
    // loop through each of the people
    for (var index = 0; index < numPeople; index++ ){
        // shake each person’s hand who you haven’t shaken yet
        total_count += (numPeople - index - 1);
    }
    return total_count;
}