RunKit + 
Try any Node.js package right in your browser
This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including flatmap-fast. Try it out:
(() => {
'use strict';
const flatMap = require("flatmap-fast");
const testArr = ['Hi', 'World'];
const splitWord = (word) => word.split('');
console.log(
flatMap(testArr, splitWord)
);
// => ['H', 'i', 'W', 'o', 'r', 'l', 'd']
console.log(
flatMap([1, 2, 3, 4], (x) => [x, x * 2])
);
// => [1, 2, 2, 4, 3, 6, 4, 8]
})();
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