better-fp.js

                              
// Better way

const getValue = ({value}) => value;
const add = x => y => x + y;
const addTen = add(10);
const multiply = x =>  y => x * y;
const displayValue = string => value => `${string}::${value}`;
const displayLeverageRatio = displayValue('Leverage Ratio');

const packageValueWithCaption = caption => value => ({caption, value})

const calculateValueAndCreateObject = compose(
    packageValueWithCaption("Some Value:: "),
    multiply(2),
    getValue
)

calculateValueAndCreateObject({value:1000}) //? ({caption: Some Value, value: 200000})


const calculateSomeVal = compose(
    displayValue("Some Value:: "),
    multiply(2),
    getValue
)

calculateSomeVal({value:10000}) //? S

function-compostion.js

const compose = (...fns) => initialValue => fns.reduceRight((val, fn) => fn(val), initialValue)
const dummyWrite = (string) => `${string}`;

const writeString = ({ string }) => `${string}`;
const writeValueWithCaption = ({ calculationForUi, caption }) =>
  `${caption}:: ${calculationForUi}`;

const trace = (label) => (value) => {
  console.log(label + "::", value);
  return value;
};

const multiplyValueByTwo = ({ value }) => value * 2;
const subtractByTwo = ({value}) => value - 2;
subtractByTwo(1000) //?
subtractByTwo({value: 1000}) //?

const composedWriteFn =
compose(
  writeValueWithCaption,
  (x) => ({ ...x, caption: writeString(x) }),
  (x) => ({ ...x, calculationForUi: x.fn(x) }) //?
);


composedWriteFn({value: 10000, string: 'new notional value', fn: multiplyValueByTwo}) //?
composedWriteFn({ value: 2.8, string: "current leverage ratio", fn: subtractByTwo }); //?