for testing and deploying your application
for finding and fixing issues
for empowering human code reviews
export class ArrayUtils {
public static range(start: number, end: number, step: number = 1) {
function* generateRange() {
let x = start - step;
while (x <= end - step) {
yield (x += step);
}
return {
[Symbol.iterator]: generateRange
};
public static flatMap<T, V>(items: T[], fn: (x: T) => V[]): V[] {
const arr = [];
for (let item of items) {
arr.push(...fn(item));
return arr;
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