chalu

let binarySearch = (haystack, needle) => {
  let allNums = haystack.every( entry => !isNaN(entry) );
  let needleIsNum = !isNaN(needle);

  if( needleIsNum && allNums){
    // prepare inputs
    haystack = haystack.sort( (a, b) => a - b );

    // define Algol
    let bSearchr = (aHaystack) => {

chalu

// Generate similar data from https://www.generatedata.com/
const dummyData = {
  developers: [
    {
      "id": "870D1B3F-9259-99A7-F18E-18CA40B3B284",
      "name": "Heather Bullock",
      "experience": 12,
      "stack": "iOS"
    },

chalu

const countdownA = (limit) => {
  for(let i = limit; i >= 1; i--) {
     console.log('Now @ ' + i);
  }
};

const countdownB = (limit) => {
  console.log('Now @ ' + limit);
  if (limit === 1) return 1;
  

chalu

export const add = (x, y) => x + y;
export const minus = (x, y) => x - y;
export const divide = (x, y) => x / y;
export const multiply = (x, y) => x * y;

chalu

[{
  name: 'Alpha Ndimurukundo',
  age: 33,
  gender: 'Male',
  country: 'Rwanda',
  company: 'Andela'
}, ...]

chalu

const computed = data.reduce((sum, {age = 0}, index) => {
  const value = sum + age;
  if(index === data.length-1) return value / data.length;
  return value;
}, 0);

chalu

{
  name: 'Alpha Ndimurukundo',
  age: 33,
  gender: 'Male',
  country: 'Rwanda',
  company: 'Andela'
}

chalu

const sumAges = compute(sumOf, 'age');
const sumOfAge = sumAges(data);

chalu

const avgAge = compute(averageOf, 'age');
const avgOfAges = avgAge(data);

chalu

const compute = (delegate, field) => {
  return (data) => delegate(data, field);
};