You can find all the code in this post at the repo Github.
Iterable related challenges
Iterable
/**
* @param {any} data
* @return {object}
*/
function createCustomIterable(data) {
return {
[Symbol.iterator]() {
let index = 0;
return {
next() {
if (index < data.length) {
return {
value: data[index++],
done: false,
};
} else {
return {
value: undefined,
done: true,
};
}
},
};
},
};
}
// Usage example:
const customIterable = createCustomIterable([1, 2, 3, 4]);
// Using for...of loop
for (const item of customIterable) {
console.log(item);
}
/**
* 1
* 2
* 3
* 4
*/
// Using spread operator
const arrayFromIterable = [...customIterable];
console.log(arrayFromIterable); // => [1, 2, 3, 4]
// Using Array.from()
const anotherArray = Array.from(customIterable);
console.log(anotherArray); // => [1, 2, 3, 4]
Reference
- Iterator - MDN
- Iteration protocols - MDN
- [Iterator.prototypeSymbol.iterator - MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Iterator/Symbol.iterator)
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