Mastersam07

void main() {
  print(getIndex('Red'));
}

// a function that returns the index of a particular resistor color
// taking the color as argument
int getIndex(color) {
  var dict = {
    'Black': 0,
    'Brown': 1,

Mastersam07

void main() {
  print(reverse('30days of code')); // should pass
  print(reverse('30daysofcode')); // should pass
}

// a function that prints out the reverse of a string
// here we split the string, reverse the array and join
// we should also remove white spaces. 
String reverse(word) {
  String newString = word.replaceAll(" ", "").split('').reversed.join();

Mastersam07

void main() {
  print(isleapyear(1996)); // a true leap year
  print(isleapyear(2000)); // a true leap year
  print(isleapyear(1900)); // a false leap year
}

bool isleapyear(int year) =>
    (year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0));

Mastersam07

void main() {
  print(isIsogram('')); // should return true
  print(isIsogram('30days - of code')); // should return false
  print(isIsogram('as -d f- gh')); // should return true as hyphen and spaces are allowed multiple times
  print(isIsogram('a')); // single letter should return true
  print(isIsogram('36797')); // single number should return false
}

// String letters = 'abcdefghijklmnopqrstuvwxyz';

Mastersam07

void main() {
  print(countWords( "That's the password: PASSWORD 123!, cried the Special Agent.\nSo I fled.")); // should do a proper count
  print(countWords("You you YOU")); // should return you:3 as it is case insensitive
  print(countWords("3,3,3")); // should return 3:3 as stated in the problem
  print(countWords("333")); // should return 333:1 as stated in the problem
}

// Hold the input in a map for key value pairs
// Using RegExp to ensure it matches the format in the prob statement

Mastersam07

import 'dart:math';

void main() {
//   uncomment below for list n difference of squares with i < n+1
//   for (int i = 0; i < 11; i++) { // for a list of difference from 0 to 10
//     print(differenceOfSquares(i));
//   }
  print(differenceOfSquares(10)); // returns 3025 - 385 = 2640.
}

Mastersam07

void main() {
  num number = 60;
  print('prime factors of $number: ${primeFactors(number)}');
}

primeFactors(number) {
  var factors = [], i = 2;
  while (number > 1) {
    if (number % i == 0) {
      factors.add(i); number /= i; i = 2;

Mastersam07

// pascal triangle

void main() {
  print(pascalTriangle(5)); // [[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1]]
  print("--------------------------");
  print(pascalTriangle(1)); // should return 1
  print("--------------------------");
  print(pascalTriangle(0)); // should return empty []
  print("--------------------------");
  print(pascalTriangle(-6)); // should return -1

Mastersam07

void main() {
  Triangle firstTriangle = Triangle(10, 10, 15);
  Triangle secondTriangle = Triangle(10, 15, 20);
  Triangle thirdTriangle = Triangle(10, 10, 10);
  print(firstTriangle.triangleType);
  print(secondTriangle.triangleType);
  print(thirdTriangle.triangleType);
}

class Triangle {

Mastersam07

void main() {
  String s = 'The quick brown fox jumps over the lazy dog';
  print(isPanagram(s));
}

bool isPanagram(String phrase) {
  List<String> alphas = 'abcdefghijklmnopqrstuvwxyz'.split(''); // all alphabets
  var newPhrase = phrase
      .replaceAll(' ', '')
      .toLowerCase(); // remove spaces and take to lower case