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  1. BACKGROUND: Recently I discovered a nifty Javascript function that counts the like values of an index array and returns as its value an object whose property-value pairs consist of a single repeated value and its corresponding frequency. Unfortunately, I am having trouble understanding how the function works. As I have adapted it to fit my own needs I have changed the variable names. Indeed, this change may be the source of my own confusion. The FUNCTION: function dateCounter(dates) { return dates.reduce( (countDates, date) => { countDates[date] = ++countDates[date] || 1; return countDates; }, {} ); } REQUEST: Please write in plain English what the so-called reducer function of the reduce( ) function is achieving with each iteration. I am baffled. Roddy
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