A rather geeky/technical weblog, est. 2001, by Bramus
array.groupBy() and array.groupByToMap()
An ECMAScript Proposal that recently made it to Stage-3 is “array grouping”. It brings us array.groupBy() and array.groupByToMap() methods to easily group arrays.
Array#map(), reduce(), and filter()In The Trouble With Loops I found these nice and simple examples covering Array#map(), Array#reduce(), and Array#filter(). const dollars = [32, 45, 50]; // map(): When you want to translate values in an array into another set of values. const euros = dollars.map(eachAmount => eachAmount * .93); // reduce(): When you want a total based …
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