test.js

'use strict';

const testArr = ['Hi', 'World'];
const splitWord = (word) => word.split('');

const flatMapFast = require('./index.js');

/* https://www.npmjs.com/package/flatmap v0.0.3 */
const flatmapjs = function (arr, iter, context) {
    var results = [];
    if (!Array.isArray(arr)) return results;
    arr.forEach(function (value, index, list) {
        var res = iter.call(context, value, index, list);
        if (Array.isArray(res)) {
            results.push.apply(results, res);
        } else if (res != null) {
            results.push(res);
        }
    });
    return results;
};

const testPerf = require('testperf');

testPerf("flatMapFast", flatMapFast, testArr, splitWord);
console.log(
    flatMapFast(testArr, splitWord)
);

testPerf("flatmapjs", flatmapjs, testArr, splitWord);
console.log(
    flatmapjs(testArr, splitWord)
);

testPerf("flatMapFast", flatMapFast, [1, 2, 3, 4], (x) => [x, x * 2]);
console.log(
    flatMapFast([1, 2, 3, 4], (x) => [x, x * 2])
);

testPerf("flatmapjs", flatmapjs, [1, 2, 3, 4], (x) => [x, x * 2]);
console.log(
    flatmapjs([1, 2, 3, 4], (x) => [x, x * 2])
);