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Roderick HungFront End Web Development Techdegree Student 16,811 Points
Explain for loop in playToken().
How does the for loop set the target space to the last empty space in the column.
I realized it's been awhile since the question was asked, but for anyone else:
They don't all become the target space. As the for loop iterates through the column, it sets targetSpace to the current space in the iteration. In other words, since the targetSpace variable is declared with 'let', each time the for loop runs it replaces the variable with the new iteration. Furthermore, it only replaces the declaration if the space is not null. That means that when the loop is finished, the last space in the column (the bottom space) that is not null will be the value of the the targetSpace variable.