Ramda array to multiple argument function

Question

Given the input of string 6-10, I want to obtain a list of numbers [6,6.5,7,7.5,8,8.5,9,9.5,10].

This is what I have come up with:


const x = "6-10";
const sizeMinMax = R.pipe(R.split('-'), R.map(parseInt))
sizeMinMax(x); //[6,10]

const sizesStepped = (min, max) => R.unfold(minSize => minSize > max ? false : [minSize, minSize + 0.5], min)
sizesStepped(8,10); // [8,8.5,9,9.5,10]

How do I pipe the output of sizeMinMax(x) which is an array to sizeStepped function with 2 arguments?

var sizesStepped = (min, max) => Array.from({length: (max - min) * 2 + 1}, (_, i) => min + i*0.5) — zerkms
– zerkms, Commented Nov 15, 2020 at 10:07

Ori Drori · Accepted Answer · 2020-11-15 10:31:17Z

2

Wrap sizesStepped with R.apply:

const sizeMinMax = R.pipe(R.split('-'), R.map(parseInt))

const sizesStepped = (min, max) => R.unfold(minSize => minSize > max ? false : [minSize, minSize + 0.5], min)

const fn = R.pipe(sizeMinMax, R.apply(sizesStepped));

const x = "6-10"

const result = fn(x)

console.log(result); // [8,8.5,9,9.5,10]

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.27.1/ramda.min.js" integrity="sha512-rZHvUXcc1zWKsxm7rJ8lVQuIr1oOmm7cShlvpV0gWf0RvbcJN6x96al/Rp2L2BI4a4ZkT2/YfVe/8YvB2UHzQw==" crossorigin="anonymous"></script>

answered Nov 15, 2020 at 10:31

Ori Drori

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Comments

phi-rakib · Accepted Answer · 2020-11-15 10:06:53Z

2

You can do it in vanilla JavaScript by implementing a range method.

const range = (start, stop, step) =>
  Array.from({ length: (stop - start) / step + 1 }, (_, i) => start + i * step);

const x = '6-10';
const [s, e] = x.split('-');
const step = 0.5;
const ret = range(+s, +e, step);
console.log(ret);

answered Nov 15, 2020 at 10:06

phi-rakib

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1 Comment

daisura99 Over a year ago

While I appreciate the solution to my problem with vanilla javascript, I was looking more for a Ramda solution, I apologise for not stating this.

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