jamessergeant

// Cat carousel

$(function() {
  $('.thumbnail img').click(function(event) {
    $('.hero img').attr('src',$(this).attr('src'));
  })
});

// Fizzbuzz (should probably break down to separate functions as in reference solution)

jamessergeant

// discussed when used in mostFrequentWord
function getTokens(rawString) {
  // NB: `.filter(Boolean)` removes any falsy items from an array
  return rawString.toLowerCase().split(/[ ,!.";:-]+/).filter(Boolean).sort();
}
  
function mostFrequentWord(text) {
  var words = getTokens(text);              // splits text by spaces and punctuation into array of words (strings), removes empty strings and sorts
  var wordFrequencies = {};                 // declare variable and initialise with empty object, this is used as a frequency counter
  for (var i = 0; i <= words.length; i++) { // loop over words

jamessergeant

function makeStudentsReport(data) {
  return data.map(function(student) {
    return `${student.name}: ${student.grade}`
  })
}

function enrollInSummerSchool(students) {
  return students.map(function(student) {
    return {
      name: student.name,

jamessergeant

function createMyObject() {
  var obj = {
    foo: 'bar',
    answerToUniverse: 42,
    'olly olly': 'oxen free',
    sayHello: function() {
      return 'hello';
    }
  }
  return obj

jamessergeant

What is scope? Your explanation should include the idea of global vs. local scope.

Scope determines where a variable can be accessed. A variable with local scope can only be accessed within that function. A variable with global scope can be accessed anywhere unless it's variable name is shadowed by a local variable.

Why are global variables avoided?

To avoid unexpected or indeterminate behaviour.

Explain JavaScript's strict mode

Strict mode forces a variety of conventions including the use of the var keyword when declaring variables.

What are side effects, and what is a pure function?

jamessergeant

function max(numbers) {
  var max = -Infinity;
  for (i=0; i < numbers.length; i++) {
    max = max > numbers[i] ? max : numbers[i];
  }
 return max
}


function min(numbers) {

jamessergeant

function makeList(item1, item2, item3) {
  return [item1, item2, item3];
}

function addToList(list, item) {
  list.push(item);
  return list;
}

function accessFirstItem(array) {

jamessergeant

function doTrafficLights() {
  var activeLight = getActiveLight();
  if (activeLight === 'red') {
    turnRed();
  } else if (activeLight === 'yellow') {
    turnYellow();
  } else if (activeLight === 'green') {
    turnGreen();
  }
}

jamessergeant

function computeArea(width, height) {
  return width * height;
}

function celsToFahr(celsTemp) {
  return celsTemp * 9 / 5 + 32;
}

function fahrToCels(fahrTemp) {
  return (fahrTemp - 32) * 5 / 9;

jamessergeant

// Would recommend finding a way to hide the test function...

function wisePerson(wiseType, whatToSay) {
  return 'A wise ' + wiseType + ' once said: "' +
      whatToSay + '".';
}

function shouter(whatToShout) {
  return whatToShout.toUpperCase() + '!!!';
}