Math.sum or a likewise, baked in API. Fear not — summing an array of numbers is easy using
const numbers = [1, 2, 3, 4]; const sum = numbers.reduce((a, b) => a + b, 0);
0 represents the starting value while with
b, one represents the running total with the other representing the value to be added. You’ll also note that using
reduce prevents side effects! I’d still prefer something like
Math.sum(...numbers) but a simple
reduce will do!
As more devices emerge and differences in device interaction are implemented, the more important good CSS code will become. In order to write good CSS, we need some indicator about device capabilities. We’ve used CSS media queries thus far, with checks for max-width and pixel ratios.