Convert your Coffeescript loop that uses the range method into ES6 syntax

Question

Convert your Coffeescript loop that uses the range method into ES6 syntax

Disclaimer: Although I acknowledge the impact Coffeescript has had on the ES6 spec, I personally look forward to moving on from it.

The following Coffeescript loop (written by someone else)

if @props.total>1
  for page in [<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="d6e7f8f896a6a4b9a6a5f8a2b9a2b7ba">[email protected]</a>]
    active = (page is <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e5cea595978a9596cb86909797808b91">[email protected]</a>)

translates to this JavaScript code according to js2coffee

var active, i, page, ref;

if (this.props.total > 1) {
  for (page = i = 1, ref = this.props.total; 1 <= ref ? i <= ref : i >= ref; page = 1 <= ref ? ++i : --i) {
    active = page === +this.props.current;
  }
}

Now, I am interested in utilizing a for..of loop to simplify that JavaScript code, but I'm struggling with how to approach it.

I attempted to apply this concept (specifically the generator function at the bottom), but haven't been successful.

So my query is: Is there a method for creating ranges in ES6?

javascript arrays coffeescript ecmascript-6

Answer 1

Answer №1

The ideal solution for generating the desired outcome is as follows:

function* createRange(startingNumber, end=Infinity) {
    while (startingNumber <= end) {
        yield startingNumber++;
    }
}

// If (this.props.count > 1) - automatically handled by `createRange`
for (let pageNumber of createRange(1, this.props.count)) {
    activePage = pageNumber === +this.props.current;
}

Answer 2

The ideal solution for generating the desired outcome is as follows:

function* createRange(startingNumber, end=Infinity) {
    while (startingNumber <= end) {
        yield startingNumber++;
    }
}

// If (this.props.count > 1) - automatically handled by `createRange`
for (let pageNumber of createRange(1, this.props.count)) {
    activePage = pageNumber === +this.props.current;
}

Answer 3

Answer №2

To generate a sequence of consecutive integers with a specified length k starting at n in JavaScript, you can use the following code snippet:

Array.apply(null, Array(k)).map((x, i) => i + n);

Although not exactly equivalent to the range functionality in Coffeescript, this solution is close enough for most practical purposes. Additionally, it eliminates the need to differentiate between exclusive (..) and inclusive (...) syntax.

Answer 4

To generate a sequence of consecutive integers with a specified length k starting at n in JavaScript, you can use the following code snippet:

Array.apply(null, Array(k)).map((x, i) => i + n);

Although not exactly equivalent to the range functionality in Coffeescript, this solution is close enough for most practical purposes. Additionally, it eliminates the need to differentiate between exclusive (..) and inclusive (...) syntax.

Convert your Coffeescript loop that uses the range method into ES6 syntax

Answer №1

Answer №2

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