Dyna-count NPM

About dyna-count

Simplifies the for loop.

It also offers a map.

for

Instead of

for (let i = 0; i < 1000; i++) console.log(i);

you can

count(1000).for(i => console.log(i))

or simpler

count(1000).for(console.log)

You can for with step

count(10, 2).for(index => console.log(index)) // consoles: 0, 2, 4, 6, 8

You can break a for, calling the 2nd argument of the for's callback

let collected = [];
count(20).for((index, breakIt) => {
    collected.push(index);
    if (index === 9) breakIt();
});
// 0..9 items are only collected

map

You can map also the iteration, useful for data generation.

let items = [];
count(3).map(i => items.push(i));
// items is now [0, 1, 2]

In Typescript, map supports types, for example:

let items: string[] = [];
count(3).map<string>(i => items.push(i.toString()));
// items is now ['0', '1', '2']

You can map with step in the same way as with for.

You can break in the same way as with for.

countFromTo

Similarly, we have and the countFromTo

for

countFromTo(100, 200).for(i => console.log(i))

map

let items = [];
countFromTo(10, 13).map(i => items.push(i));
// items is now [10, 11, 12]

reduce

reduced = count(3).reduce>((acc, index) => {
  acc[`key-${index}`] = `Key is ${index}`;
  return acc;
}, {});
// reduced is equal to {"key-0": "Key is 0", "key-1": "Key is 1", "key-2": "Key is 2" }