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 /* a) modelling our solar system */

function convertDistance(planet) {
  var kmDistance = planet.distance * 150000000;
  return kmDistance + ' km.';
}

function convertMass(planet) {
  var kgMass = planet.mass * 5.97;
  return kgMass + '  10^24 kg.';

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function(x, y) {
  return x / y;
}

function (array, callback) {
array.forEach(callback(element) {
  });
};

function (callback, array) {

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function divide(x, y) {
  return x / y;
}

function changeArrayElements(array, action) {
  for (var i = 0; i < array.length; i++) {
    action(array[i]);
  }
};

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let shortArray = new Array(2)

let longArray = new Array(1000)

let getNthItem = (n, array) => {
  return array[n];
}

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let populateArray = (array) => {
  for (var i of array) {
    array[i] = i;
  }
}

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let binaryBubbleSort = (array) => {
  var lowIndex = array[0];
  var highIndex = array[array.length -1];
  var timesThrough = 0;
  while (lowIndex <= highIndex){
    var middleIndex = (highIndex + lowIndex) / 2;

   if (array[middleIndex] < value) {
      lowIndex = middleIndex + 1;
    } else if (array[middleIndex] > value) {

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 function bubbleSort(array) {
     var i, j;
     for (i = array.length - 1; i >= 0; i--) {
         for (j = 0; j <= i; j++) {
             if (array[j + 1] < array[j]) {
                 var temp = array[j];
                 array[j] = array[j + 1];
                 array[j + 1] = temp;
             }
         }

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// A S Y N C H R O N O U S FXN USING  A  C A L L B A C K
var fetchFile = function(filePath, callback) {
  readFile(filePath, (err, contents) => {
    if (err) { 
    return callback(err); 
    } else {      
      callback(contents);
     }
  });
};

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fetchFile = (filePath) => {
  return new Promise((resolve, reject) => {
    readFile(filePath, (err, contents) => {
      if (err) { return reject(err); }
    });
    resolve(contents);
  }).then();
};

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function a() {
  setTimeOut(function() {
    console.log('a');
    b();
    
  }, 2000);
};