Writing a single method for arrays and a single element
Rather than writing separate methods to handle an array and a single element parameter, write your functions so they can handle both. This is similar to how some of jQuery’s functions work (css
will modify everything matched by the selector).
You just have to concat everything into an array first. Array.concat
will accept an array or a single element.
function printUpperCase(words) {
var elements = [].concat(words || []);
for (var i = 0; i < elements.length; i++) {
console.log(elements[i].toUpperCase());
}
}
printUpperCase
is now ready to accept a single node or an array of nodes as its parameter. It also avoids the potential TypeError
that would be thrown if no parameter was passed.
printUpperCase("cactus");
// => CACTUS
printUpperCase(["cactus", "bear", "potato"]);
// => CACTUS
// BEAR
// POTATO

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