I am building a picture framing REST API calculator using Node JS. The code I've written for it is this: Therefore, the input JSON POST request would be, for example: The response would be: Width Cut = 3", Height Cut = 1 3/4" The problem I'm running into is that I can't seem to figure out how to allow for

How can mixed number JSON inputs be converted to numbers using split() and reduce() in Node JS?

I am building a picture framing REST API calculator using Node JS. The code I’ve written for it is this:

app.post("/api/calculator/singlematapi", (req,res) => {
    
    let FrameWidth = 1 * req.body.FrameWidth.split("/").reduce((a, b) => a / b);
    let FrameWidthFraction = 1 * req.body.FrameWidthFraction.split("/").reduce((a, b) => a / b);
    let FrameHeight = 1 * req.body.FrameHeight.split("/").reduce((a, b) => a / b);
    let FrameHeightFraction = 1 * req.body.FrameHeightFraction.split("/").reduce((a, b) => a / b);
    let PictureWidth = 1 * req.body.PictureWidth.split("/").reduce((a, b) => a / b);
    let PictureWidthFraction = 1 * req.body.PictureWidthFraction.split("/").reduce((a, b) => a / b);
    let PictureHeight = 1 * req.body.PictureHeight.split("/").reduce((a, b) => a / b);
    let PictureHeightFraction = 1 * req.body.PictureHeightFraction.split("/").reduce((a, b) => a / b);
    let MatOverlap = 1 * req.body.MatOverlap.split("/").reduce((a, b) => a / b);
    let MatOverlapFraction = 1 * req.body.MatOverlapFraction.split("/").reduce((a, b) => a / b);
    let width = (1/2)*((FrameHeight+FrameHeightFraction)-(PictureHeight+PictureHeightFraction)+(MatOverlap+MatOverlapFraction));
    let height = (1/2)*((FrameWidth+FrameWidthFraction)-(PictureWidth+PictureWidthFraction)+(MatOverlap+MatOverlapFraction));
    res.send(`Width Cut = ${new Fraction(height).toString()}", Height Cut = ${new Fraction(width).toString()}"`);
});

Therefore, the input JSON POST request would be, for example:

{
    "FrameWidth": "16",
    "FrameWidthFraction": "1/2",
    "FrameHeight": "20",
    "FrameHeightFraction": "0",
    "PictureWidth": "11",
    "PictureWidthFraction": "0",
    "PictureHeight": "17",
    "PictureHeightFraction": "0",
    "MatOverlap": "0",
    "MatOverlapFraction": "1/2"
}

The response would be: Width Cut = 3", Height Cut = 1 3/4"

The problem I’m running into is that I can’t seem to figure out how to allow for mixed numbers in my key/value pairs of my object.

I currently have to have a separate key/value pair for the integer, and a separate pair for the fraction as shown above, for example:

{
    "FrameWidth": "16",
    "FrameWidthFraction": "1/2"
}

My goal is to reduce the number of key/value pairs by allowing mixed numbers as an input like this:

{
    "FrameWidth": "16 1/2"
}

The piece of code in question:

let FrameWidth = 1 * req.body.FrameWidth.split("/").reduce((a, b) => a / b);
let FrameWidthFraction = 1 * req.body.FrameWidthFraction.split("/").reduce((a, b) => a / b);

…only allows for individual integers or individual fractions, but not a combined mixed number.

Can mixed number inputs in JSON be converted to numbers using split() and reduce() in Node JS with the code I’m using?

Answer

This problem has been resolved by using the correct split() and reduce() methods.

Reading examples from here: JavaScript reduce() Method and from here: JavaScript split() Method

I was able to fix my issue by finding:

let FrameWidth = 1 * req.body.FrameWidth.split("/").reduce((a, b) => a / b);

And changing it to:

let FrameWidth = 1 * req.body.FrameWidth.split("/").reduce((a, denom) => a.split(" ").reduce((int, numer) => 1 * numer + int * denom) / denom);

Therefore, the input JSON POST request would become:

{
    "FrameWidth": "16",
    "FrameHeight": "20",
    "PictureWidth": "11",
    "PictureHeight": "17",
    "MatOverlap": "1 1/2"
}

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Answer