.pipe( ) function in JS

.pipe( )

// pipe function: A pipe function takes an n sequence of operations; in which each operation takes an argument; 
// process it; and gives the processed output as an input for the next operation in the sequence. The result of a 
// pipe function is a function that is a bundled up version of the sequence of operations.
//======= two functions in pipe function =========
const pipe = (op1, op2) => {
  return (arg) => {
   const result1 = op1(arg);
   return op2(result1);
  }
}

// ======= refactor the pipe function ============
const pipe = (op1, op2) => (arg) => op2(op1(arg));


// ========== more functions in pipe func ===========
// Utilize the previous pipe function that accepts only two functions
const _pipe = (a, b) => (arg) => b(a(arg));

// The rest parameters creates an array of operations
const pipe = (...ops) => {
  
  // Iterate over the array of operations
  // By using reduce, merge all operations into a single bundle
  let bundle = ops.reduce((prevOp, nextOp) => {
    return _pipe(prevOp,nextOp);
  });
  return bundle;
}

// ========== refactor one =================
const _pipe = (a, b) => (arg) => b(a(arg));

// Refactored
const pipe = (...ops) => ops.reduce(_pipe)