FP in JS

float-array-to-hex-string.js

requirejs.config({
  paths: {
    ramda: 'https://cdnjs.cloudflare.com/ajax/libs/ramda/0.13.0/ramda.min'
  }
});

require(['ramda'], function (_) {
  const trace = _.curry(function(tag, x) {
    console.log(tag, x);
    return x;
  });

  const multiply = _.curry(function(a, b) {
    return b * a;
  });

  const multiplyBy255 = multiply(255);

  const floatToColorInt = _.compose(Math.floor, multiplyBy255);

  const intToHexString = _.curry(function(rad, i) {
    return i.toString(rad);
  })(16);

  const padWithZero = function(h) {
    return h = h.length === 1 ? "0" + h : h;
  };

  const intToPaddedHexString = _.compose(padWithZero, intToHexString);

  const floatToHex = _.compose(intToPaddedHexString, floatToColorInt);

  const join = _.curry(function(s, a) {
    return a.join(s);
  });

  const joinWithSpace = join("");

  const addHash = function(s) {
    return "#" + s;
  };

  const hexArrayToString = _.compose(addHash, joinWithSpace);

  const floatArrayToHexString = _.compose(hexArrayToString, _.map(floatToHex));

  console.log(floatArrayToHexString([0.984, 0.352, 0.619]));
});