Simplifying calculation of arrays with Ramda - ramda.js

Question

I would like to calculate the three arrays like this.
const Data = {
x : [2,4,6],
y : [10,10,10],
z : [5,5,5]
}
const XtimesYplusZ = zipWith (add, (zipWith (multiply, Data.x, Data.y)), Data.z)
console.log(XtimesYplusZ);//[25,45,65]
This code works ok, but not very good in terms of readability.
So, now I created calculation patterns that could be applied later on:
const calc1 = ({x, y, z}) => x * y + z
console.log(calc1(Data)); //ERROR
This is not working. I have many different patterns such as ({x, y, z}) => x / y - z, ({x, y, z}) => (x + y) * z and so on. What is the standard calculation method for arrays something like this?
REPL

Answer 1

In this example:
const calc1 = ({x, y, z}) => x * y + z
console.log(calc1(Data)); //ERROR
You are trying to add and multiply arrays, and not the arrays' items.
Using R.zipWith won't work as well, since it requires actual arrays, and is limited to zipping 2 arrays at a time.
An easier solution would be to get the sub-arrays using R.props, transpose them ([[2, 10, 5], [4, 10, 5]]...), and then map and combine the values using your calc function (I've replace the object destructuring with array destructuring):
const { pipe, props, transpose, map } = R
const calc = ([x, y, z]) => x * y + z
const fn = pipe(props(['x', 'y', 'z']), transpose, map(calc))
const Data = {
x : [2,4,6],
y : [10,10,10],
z : [5,5,5]
}
const XtimesYplusZ = fn(Data)
console.log(XtimesYplusZ) // [25,45,65]
<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.27.1/ramda.min.js" integrity="sha512-rZHvUXcc1zWKsxm7rJ8lVQuIr1oOmm7cShlvpV0gWf0RvbcJN6x96al/Rp2L2BI4a4ZkT2/YfVe/8YvB2UHzQw==" crossorigin="anonymous"></script>
This example show Scott's suggestion of extracting out the combination of R.transpose, and R.map to create a zipAllWith function:
const { curry, map, apply, transpose, pipe, props } = R
const zipAllWith = curry((fn, xss) => map(apply(fn), transpose(xss)));
const fn = pipe(props(['x', 'y', 'z']), zipAllWith((x, y, z) => x * y + z))
const Data = {
x : [2,4,6],
y : [10,10,10],
z : [5,5,5]
}
const XtimesYplusZ = fn(Data)
console.log(XtimesYplusZ) // [25,45,65]
<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.27.1/ramda.min.js" integrity="sha512-rZHvUXcc1zWKsxm7rJ8lVQuIr1oOmm7cShlvpV0gWf0RvbcJN6x96al/Rp2L2BI4a4ZkT2/YfVe/8YvB2UHzQw==" crossorigin="anonymous"></script>