javascriptFunctions

fizzbuzz.js

for (i=1; i<=100; i++){
  if (i % 3 == 0 && i % 5 == 0){
    console.log( "Fizzbuzz!");
  }
  else if (i % 3 == 0 && i % 5 != 0) {
    console.log("Fizz");
  }
  else if (i % 3 != 0 && i % 5 == 0){
    console.log("Buzz");
  }
  else{
    console.log(i);
  }
}

fizzbuzz.rb

(1..100).each do |i|
  if i % 3 == 0 && i % 5 == 0
    puts "Fizzbuzz!"
  elsif i % 3 == 0 && i % 5 != 0
    puts "Fizz"
  elsif i % 3 != 0 && i % 5 == 0
    puts "Buzz"
  else
    puts i
  end
end

function_js.js

//  Part I
 
/**
 * use any of the looping methods discussed in class
 *
 * 1. for loop,
 * 2. Array.forEach,
 * 3. custom forEach
 *
 * to complete the following problems
 */
 
// 0. write your own forEach() that takes two arguments: an array, and a callback
 
function forEach(array, callback){
    for (var i = 0; i < array.length; i++) {
       callback(array[i]); 
    };
}
 
// testing your code with console.assert
var total = 1;
forEach([1, 2, 3, 4], function(a){ total *= a; });
// and finally assert; if this fails, the program stops
console.assert(total === 24);
 
 
// 1. calculate the sum of numbers (returns the sum (A NUMBER))
 
function sum(){
    // parse arguments into an array
    var args = [].slice.call(arguments);
    var total = 0; 
    forEach(args, function(a){ total += a; });
    return total;
}
 
console.assert( sum(1, 2, 3, 4, 5) === 15 )
 
// 2. calculate the average of numbers (returns the average (A NUMBER))
 
function average(){
    // parse arguments into an array
    var args = [].slice.call(arguments);
    var total = 0;
    forEach(args, function(a){ total += a; });
    return total / args.length;
}
 
console.assert( average(2, 4, 6, 8) === 5 )
 
// 3. find the largest number of the inputs (returns the largest input (A NUMBER))
 
function largest(){
    // parse arguments into an array
    var args = [].slice.call(arguments);
    var l = 0;
    forEach(args, function(a){
        if (a > l) { l = a; };
    });
    return l;
}
 
console.assert( largest(2, 4, 6, 8) === 8 )
 
// 4. find the longest string of the inputs (returns the longest input (A STRING))
 
function longest(){
    // parse arguments into an array
    var args = [].slice.call(arguments);
    var l = "";
    forEach(args, function(a){
        if (a.length > l.length) { l = a; };
    });
    return l;
}
 
console.assert( longest("shelby", "boss", "mach1", "rousche") === "rousche" )
 
// 5. write a function that can sort an array of Date objects (returns a NEW ARRAY of Date's)
 
function sort(){
    // parse arguments into an array
    var args = [].slice.call(arguments);
    return args.sort(function(a,b) {
        return a > b; 
    })
}
 
var dates = [
    new Date("Oct 2, 2015"),
    new Date("Oct 1, 2015"),
    new Date("Jan 2, 2015"),
    new Date("Dec 5, 2014"),
    new Date("Mar 27, 2015")
]
 
var sorted = sort(dates[0], dates[1], dates[2], dates[3], dates[4]);
 
console.assert(
    sorted[0] === dates[3] &&
    sorted[1] === dates[2] &&
    sorted[2] === dates[4] &&
    sorted[3] === dates[1] &&
    sorted[4] === dates[0]
)
 
/**
 * PART II
 *
 * For each of the following Array methods,
 *
 * 1. use them in an example
 * 2. write a console.assert to test them
 */
 
// .sort()
var stringArray = ["Bob", "Tom", "George", "Alfred"];
 
var sortedStringArray = stringArray.sort();
 
console.assert(stringArray[3] === "Tom");
 
// .concat()
var newArray = sortedStringArray.concat(stringArray);
console.assert(newArray[4] === "Alfred");
 
// .indexOf()
indexNumber = newArray.indexOf("Bob");
console.assert(indexNumber === 1);
 
// .split()
var newString = newArray[0].split("f");
console.assert(newString[0] === "Al");
 
// .join()
var joinedArray = newArray.join(",");
console.assert(joinedArray === "Alfred,Bob,George,Tom,Alfred,Bob,George,Tom");
 
// .pop()
 var poppedArray = newArray.pop();
 console.assert(poppedArray ==="Tom");

// .push()
 var total = newArray.push('Fred', 'Barney');
console.assert (total === 9);
 
// .slice()
var slicedArray = newArray.slice(0, 5);
console.assert(slicedArray[4] === "Alfred");
 
// .splice()
var removed = newArray.splice(5, 0, "Norbert");
console.assert(newArray[5] === "Norbert");
 
// .shift()
var shifted = newArray.shift();
console.assert(newArray[0] === "Bob");
 
// .unshift()
 var unshifted = newArray.unshift("Frank");
 console.assert(newArray[0] === "Frank");

// .filter()
var numberedArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
function isEven(value){
    return value % 2 == 0;
};
var filteredArray = numberedArray.filter(isEven);
console.assert(filteredArray[0] === 2);
 
// .map()
function timesTen(value){
    return value * 10;
};

var mappedArray = numberedArray.map(timesTen);
console.assert(mappedArray[1] === 20);
 
/**
 * PART III
 *
 * Fill in the sections below marked 'YOUR CODE HERE'.
 *
 * The code below should find all customers whose first-names start with 'J',
 * map() those people into an array of objects that have a name property:
 *
 * i.e. { name : c.firstname + " " + c.lastname }
 *
 * then sort them alphabetically
 */
 
// set up arrays
var numbers = [1, 12, 4, 18, 9, 7, 11, 3, 101, 5, 6];
var strings = ['this', 'is', 'a', 'collection', 'of', 'words'];
 
var customers = [{
    firstname: 'Joe',
    lastname: 'Blogs'
}, {
    firstname: 'John',
    lastname: 'Smith'
}, {
    firstname: 'Dave',
    lastname: 'Jones'
}, {
    firstname: 'Jack',
    lastname: 'White'
}];
 
console.log(customers);
 
var projections = customers.filter(function(c) { return c.firstname.indexOf('J') == 0 });
projections = projections.map (function(c) { return { name : c.firstname + " " + c.lastname } });
projections = projections.sort(sortByName);
 
function sortByName(c1, c2) {
    "use strict";
    //...
    return c1 > c2;
};
 
console.log(projections);

gistfile1.txt

//  Part I

/**
 * use any of the looping methods discussed in class
 *
 * 1. for loop,
 * 2. Array.forEach,
 * 3. custom forEach
 *
 * to complete the following problems
 */

// 0. write your own forEach() that takes two arguments: an array, and a callback

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

// testing your code with console.assert
var total = 1;
forEach([1, 2, 3, 4], function(a){ total *= a; });
// and finally assert; if this fails, the program stops
console.assert(total === 24);


// 1. calculate the sum of numbers (returns the sum (A NUMBER))

function sum(){
    // parse arguments into an array
    var args = [].slice.call(arguments);
    var total = 0; 
    forEach(args, function(a){ total += a; });
    return total;
}

console.assert( sum(1, 2, 3, 4, 5) === 15 )

// 2. calculate the average of numbers (returns the average (A NUMBER))

function average(){
    // parse arguments into an array
    var args = [].slice.call(arguments);
    var total = 0;
    forEach(args, function(a){ total += a; });
    return total / args.length;
}

console.assert( average(2, 4, 6, 8) === 5 )

// 3. find the largest number of the inputs (returns the largest input (A NUMBER))

function largest(){
    // parse arguments into an array
    var args = [].slice.call(arguments);
    var l = 0;
    forEach(args, function(a){
        if (a > l) { l = a; };
    });
    return l;
}

console.assert( largest(2, 4, 6, 8) === 8 )

// 4. find the longest string of the inputs (returns the longest input (A STRING))

function longest(){
    // parse arguments into an array
    var args = [].slice.call(arguments);
    var l = "";
    forEach(args, function(a){
        if (a.length > l.length) { l = a; };
    });
    return l;
}

console.assert( longest("shelby", "boss", "mach1", "rousche") === "rousche" )

// 5. write a function that can sort an array of Date objects (returns a NEW ARRAY of Date's)

function sort(){
    // parse arguments into an array
    var args = [].slice.call(arguments);
    return args.sort(function(a,b) {
        return a > b; 
    })
}

var dates = [
    new Date("Oct 2, 2015"),
    new Date("Oct 1, 2015"),
    new Date("Jan 2, 2015"),
    new Date("Dec 5, 2014"),
    new Date("Mar 27, 2015")
]

var sorted = sort(dates[0], dates[1], dates[2], dates[3], dates[4]);

console.assert(
    sorted[0] === dates[3] &&
    sorted[1] === dates[2] &&
    sorted[2] === dates[4] &&
    sorted[3] === dates[1] &&
    sorted[4] === dates[0]
)

/**
 * PART II
 *
 * For each of the following Array methods,
 *
 * 1. use them in an example
 * 2. write a console.assert to test them
 */

// .sort()
var stringArray = ["Bob", "Tom", "George", "Alfred"];

var sortedStringArray = stringArray.sort();

console.assert(stringArray[3] === "Tom");

// .concat()
var newArray = sortedStringArray.concat(stringArray);
console.assert(newArray[4] === "Alfred");

// .indexOf()
indexNumber = newArray.indexOf("Bob");
console.assert(indexNumber === 1);

// .split()
var newString = newArray[0].split("f");
console.assert(newString[0] === "Al");

// .join()

// .pop()

// .push()

// .slice()

// .splice()

// .shift()

// .unshift()

// .filter()

// .map()

/**
 * PART III
 *
 * Fill in the sections below marked 'YOUR CODE HERE'.
 *
 * The code below should find all customers whose first-names start with 'J',
 * map() those people into an array of objects that have a name property:
 *
 * i.e. { name : c.firstname + " " + c.lastname }
 *
 * then sort them alphabetically
 */

// set up arrays
var numbers = [1, 12, 4, 18, 9, 7, 11, 3, 101, 5, 6];
var strings = ['this', 'is', 'a', 'collection', 'of', 'words'];

var customers = [{
    firstname: 'Joe',
    lastname: 'Blogs'
}, {
    firstname: 'John',
    lastname: 'Smith'
}, {
    firstname: 'Dave',
    lastname: 'Jones'
}, {
    firstname: 'Jack',
    lastname: 'White'
}];

console.log(customers);

var projections = customers
.filter(function(c) {
    // YOUR CODE HERE
})
.map(function(c) {
    // YOUR CODE HERE
})
.sort(sortByName);

function sortByName(c1, c2) {
    "use strict";
    //...
}

console.log(projections);