static void Main(string[] args)
{
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
var tinderHeart = new TinderHeart();
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Kelsey");
bear.Stare();
}
//Linq stuff
var namesThatStartWithT = careBears.Where(bear => bear.Name.StartsWith('T'));
var careBearNames = careBears.Select(bear => bear.Name);
var careBearNamesThatStartWithT = careBears
.Where(bear => bear.Name.StartsWith('T'))
.Select(bear => bear.Name);
var anyTinderHearts = careBears.Any(bear => bear is TinderHeart); // returns true or false
var allTinderHearts = careBears.All(bear => bear is TinderHeart); // exits as soon as it finds a beart that is not a TinderHeart
}
static void Main(string[] args)
{
var definitions = new Dictionary <string, List <string> >();
definitions.Add("martin", new List <string> {
"smart", "strong", "important"
});
Console.WriteLine(string.Join("you is ", definitions["martin"]));
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
var tinderHeart = new TinderHeart();
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Nathan");
bear.Stare();
}
var namesThatStartWithT = careBears.Where(bear => bear.Name.StartsWith('T'));
var careBearNames = careBears.Select(bears => bears.Name);
var careBearNamesThatStartwithT = careBears
.Where(bear => bear.Name.StartsWith('T'))
.Select(bear => bear.Name);
var anyBears = careBears.Any();
var anyTinderHearts = careBears.Any(bear => bear is TinderHeart);
var allTinderHearts = careBears.All(bear => bear is TinderHeart);
var firstBear = careBears.First();
var firstBearStartingWithT = careBears.First(bear => bear.Name.StartsWith('T'));
// Throws an exception:
// var blowsUp = careBears.First(bear => bear.Name.StartsWith('W'));
var works = careBears.FirstOrDefault(bear => bear.Name.StartsWith('W'));
var skippedGrumpy = careBears.Skip(1).Take(2);
var numberOfCharacters = careBears.Sum(bear => bear.Name.Length);
var orderedBears = careBears.OrderByDescending(bear => bear.BellyBadge);
// Bedtime Bear, Birthday Bear, Cheer Bear, Friend Bear, Funshine Bear, Good Luck Bear, Grumpy Bear, Love-a-lot Bear, Tenderheart Bear, and Wish Bear.
}
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
var definitions = new Dictionary <string, List <string> >();
definitions.Add()
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
var tinderHeart = new TinderHeart();
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Crystal");
bear.Stare();
}
var namesThatStartWIthT = careBears.Where(bear => bear.Name.StartsWith('T'));
var careBearNames = careBears.Select(bear => bear.Name);
var careBearNamesThatStartWithT = careBears
.Where(bear => bear.Name.StartsWith('T'))
.Select(bear => bear.Name);
// any returns if any one matches - returns true - as soon as it finds a match it stops
var anyTinderHearts = careBears.Any(bear => bear is TinderHeart);
// all only returns true if every bear is a tinderheart
var allTinderHearts = careBears.All(bear => bear is TinderHeart);
var otherList = new List <CareBearBase>();
var firstBear = careBears.First();
var firstBearStartingWithT = careBears.First(bear => bear.Name.StartsWith('T'));
//var blowsUp = careBears.First(bear => bear.Name.StartsWith('W'));
// below will just return "null"
var works = careBears.FirstOrDefault(bear => bear.Name.StartsWith('W'));
var skippedGrumpy = careBears.Skip(1).Take(2);
var numberOfCharacters = careBears.Max(bear => bear.Name.Length);
var orderedBears = careBears.OrderBy(bear => bear.BellyBadge);
var orderedBears2 = careBears.OrderByDescending(bear => bear.BellyBadge);
}
static void Main(string[] args)
{
var definitions = new Dictionary <string, List <string> >();
definitions.Add("martin", new List <string> {
"smart", "strong", "important"
});
Console.WriteLine(string.Join(", ", definitions["martin"].Where(word => word.StartsWith('s'))));
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
var tinderHeart = new TinderHeart();
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Nathan");
bear.Stare();
}
var namesThatStartWithT = careBears.Where(bear => bear.Name.StartsWith('T'));
var careBearNames = careBears.Select(bear => bear.Name);
var careBearNamesThatStartWithT = careBears
.Where(bear => bear.Name.StartsWith('T'))
.Select(bear => bear.Name);
var anyTinderHearts = careBears.Any(bear => bear is TinderHeart); //returns true after first match //delegates or lambtha expression
var allTinderHearts = careBears.All(bear => bear is TinderHeart); // returns true only if every bear matches
var firstBear = careBears.First(); //empty param passes actualy first or pass an argument
var firstBearStartingWithTe = careBears.First(bear => bear.Name.StartsWith("Te"));
var otherList = new List <CareBearBase>();
//var blowsUp = otherList.First(); // throws an exception because there is no first item in the list
var doesntBlowUp = otherList.FirstOrDefault(); //outputs null value
var skipGrumpy = careBears.Skip(1).Take(2); // throws an exception if your list has less than 3 items
var longestName = careBears.Max(bear => bear.Name.Length);
var orderBears = careBears.OrderBy(bear => bear.BellyBadge); //orders alphabetically or OrderByDescending for reverse
//Bedtime Bear, Birthday Bear, Cheer Bear, Friend Bear, Funshine Bear, Good Luck Bear, Grumpy Bear, Love-a-lot Bear, Tenderheart Bear, and Wish Bear
Console.ReadKey();
;
}
static void Main(string[] args)
{
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
tenderHeart.Hug(grumpyBear);
var tinderHeart = new TinderHeart();
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Maria");
bear.Stare();
}
//these are filter and transformation statements: .select and .where
var namesThatStartWithT = careBears.Where(bear => bear.Name.StartsWith('T'));
var careBearNames = careBears.Select(bear => bear.Name);
var careBearNamesThatStartWithT = careBears
.Select(bear => bear.Name)
.Where(name => name.StartsWith('T'));
//the fact arrow functions: called Lambda expressions or delegate expressions
//they will "short circut": .Any will stop after finding one bear that is not a tinderheart
//.All will stop at the first tinderheart found
var anyTinderHeartBears = careBears.Any(bear => bear is TinderHeart);
var allTinderHeartBears = careBears.All(bear => bear is TinderHeart);
var firstBear = careBears.First();
var firstBearStartingWithT = careBears.First(bear => bear.Name.StartsWith("T"));
//var blowsUp = careBears.First(bear => bear.Name.StartsWith("W")); --> throws and exceptions
var works = careBears.FirstOrDefault(bear => bear.Name.StartsWith("W")); //returns as null
var skippedGrumpy = careBears.Skip(1).Take(2); //skips the 1st one, but will returnt he next 2 things
var numOfCharacters = careBears.Sum(bear => bear.Name.Length); //aslo .Max
var orderedBears = careBears.OrderBy(bear => bear.BellyBadge);
//Bedtime Bear, Birthday Bear, Cheer Bear, Friend Bear, Funshine Bear, Good Luck Bear, Grumpy Bear, Love - a - lot Bear, Tenderheart Bear, and Wish Bear
Console.ReadKey();
}
static void Main(string[] args)
{
var definitions = new Dictionary <string, List <string> >();
definitions.Add("martin", new List <string> {
"smart", "strong", "important"
});
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
var tinderHeart = new TinderHeart();
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Randy");
bear.Stare();
}
//this is like JavaScripts filter
var namesThatStartWithT = careBears.Where(BearColor => BearColor.Name.StartsWith('T'));
var careBearNames = careBears.Select(bear => bear.Name);
var careBearNamesThatStartWithT = careBears
.Where(bear => bear.Name.StartsWith('T'))
.Select(bear => bear.Name);
var anyTinderHearts = careBears.Any(bear => bear is TinderHeart);
var allTinderHearts = careBears.All(bear => bear is TinderHeart);
var firstBear = careBears.First();
var firstBearStartingWithT = careBears.First(bear => bear.Name.StartsWith('T'));
//Throws an exception
//var blowsUp = careBears.First(bear => bear.Name.StartsWith('W'));
var works = careBears.FirstOrDefault(bear => bear.Name.StartsWith('W'));
var skippedGrumpy = careBears.Skip(1).Take(2);
var numberofCharacters = careBears.Sum(bear => bear.Name.Length);
var orderedBears = careBears.OrderByDescending(bear => bear.BellyBadge);
}
static void Main(string[] args)
{
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
var tinderHeart = new TinderHeart();
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Nathan");
bear.Stare();
}
var namesThatStartWithT = careBears.Where(bear => bear.Name.StartsWith('T'));
var careBearNames = careBears.Select(bear => bear.Name);
var careBearNamesThatStartWithT = careBears
.Where(bear => bear.Name.StartsWith('T'))
.Select(bear => bear.Name);
var anyTinderHeart = careBears.Any(bear => bear is TinderHeart);
var allTinderHearts = careBears.All(bear => bear is TinderHeart);
var firstBear = careBears.First();;
var firstBearStartingWithT = careBears.First(bear => bear.Name.StartsWith('T'));
var otherList = new List <CareBearBase>();
//throws an exception
//var blowsup = careBears.First(bear => bear.Name.StartsWith('W'));
var works = careBears.FirstOrDefault(bear => bear.Name.StartsWith('W'));
var skippedGrumpy = careBears.Skip(1).Take(2);
var numberOfCharacters = careBears.Max(bear => bear.Name.Length);
var orderedBears = careBears.OrderByDescending(bear => bear.BellyBadge);
//Bedtime Bear, Birthday Bear, Cheer Bear, Friend Bear, Funshine Bear, Good Luck Bear, Grumpy Bear, Love-a-lot Bear, Tenderheart Bear, and Wish Bear.
}
static void Main(string[] args)
{
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
var tinderHeart = new TinderHeart();
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Nathan");
bear.Stare();
}
var namesThatStartWithT = careBears.Where(bear => bear.Name.StartsWith('T'));
var careBearNames = careBears.Select(bear => bear.Name);
/*LINQ*/
}
static void Main(string[] args)
{
var grumpyBear = new GrumpyBear();
grumpyBear.Care("Nathan");
var tenderHeart = new TenderHeart();
tenderHeart.Stare();
tenderHeart.Hug(grumpyBear);
var tinderHeart = new TinderHeart();
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Nathan");
bear.Stare();
}
Console.ReadLine();
}
static void Main(string[] args)
{
var definitions = new Dictionary <string, List <string> >();
definitions.Add("monica", new List <string> {
"smart", "sleepy"
});
definitions["monica"].Where(word => word.StartsWith('s'));
Console.WriteLine(string.Join("you are", definitions["monica"]));
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
var tinderHeart = new TinderHeart();
// a new list of CareBearBase
var careBears = new List <CareBearBase>()
{
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Jo");
bear.Stare();
}
// where similar to filter method from js
// will create another list but this will only have a list of bears that start with letter T
var namesThatStartWithT = careBears.Where(bear => bear.Name.StartsWith('T'));
// transformation. Change shape of collection - what the collection is made of
// returning collection of strings
var careBearNames = careBears.Select(bear => bear.Name);
// order matters
// do filtering first and then transformation for efficiency
var careBearNamesThatStartWithT = careBears
.Where(bear => bear.Name.StartsWith('T'))
.Select(bear => bear.Name);
// returning boolean expression 'is there any bear that is a TinderHeart?'
// finds the first 1 that is true, and only return that
var anyTinderHearts = careBears.Any(bear => bear is TinderHeart);
// will only return true if every care bear is a TinderHeart
// All method will look until it finds something that doesn't match, and exists out
var allTinderHearts = careBears.All(bear => bear is TinderHeart);
// first finds the first thing on the list and returns it
// can also pass in boolean expression
var firstBear = careBears.First();
// give me the first name that starts with letter T
var firstBearStartingWithT = careBears.First(bear => bear.Name.StartsWith('T'));
// will throw an exception because no name start with W
//var blowsUp = careBears.First(bear => bear.Name.StartsWith('W'));
// give first one that matches or give default view of CareBearBase
// in this case it will give null value
var works = careBears.FirstOrDefault(bear => bear.Name.StartsWith('W'));
// skip 1st item and take next 2 items
// will throw an exception if List doesn't have 3 items
var skippedGrumpy = careBears.Skip(1).Take(2);
// sum total of all bear names
var numOfChar = careBears.Sum(bear => bear.Name.Length);
// order bears by BellyBadge. Alphabetical order
var orderedBears = careBears.OrderBy(bear => bear.BellyBadge);
// Bedtime Bear, Birthday Bear, Cheer Bear, Friend Bear, Funshine Bear, Good Luck Bear, Grumpy Bear, Love-a-lot Bear, Tenderheart Bear, and Wish Bear
}
static void Main(string[] args)
{
// key is a string, but the value is a list of strings
var definitions = new Dictionary <string, List <string> >();
// key is martin, but the value is a collection of its own
definitions.Add("martin", new List <string> {
"smart", "strong", "important"
});
// this allows us to add something within this key
definitions["martin"].Where(word => word.StartsWith('s'));
Console.WriteLine(string.Join("you is ", definitions["martin"]));
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
var tinderHeart = new TinderHeart();
// to access lists, you must have using System.Collections.Generic;
// we have to be explicit with the kind of things we put into Lists
// the three items above have an "is a" relationship with the CareBearBase;
// the curly brackets at the end of the careBears variable is called an object initializer
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Nathan");
bear.Stare();
}
// bread and butter are going to be where and select
// LINQ - Language integrated queries: transforming and filtering collections of things
// LINQ allows us to use similar JS methods like map, filter, reduce
// LINQ where() is similar to JS filter()
// this method does not modify the original list; the variable below will have bears whose names begin with T
var namesThatStartWithT = careBears.Where(bear => bear.Name.StartsWith('T')).ToList();
var i = 0;
foreach (var bear in namesThatStartWithT)
{
Console.WriteLine(namesThatStartWithT[i].Name);
i++;
}
Console.ReadLine();
// transforming the List. similar to map in JS. not removing things, but changing what the collection is made of
// bear.Name tells Select that we will be returning an IEnumerable of strings
// IEnumerable are the lowest common denominator for all of our connections
// as long as it is an ienumerable, you can use linq on it
var careBearNames = careBears.Select(bear => bear.Name);
// be aware of the order in which you do things because it effects your outcome
// this order takes the original list and filters it down to a smaller subset before filtering the smaller group down more
var careBearNamesThatStartWithT = careBears.Where(bear => bear.Name.StartsWith('T')).Select(bear => bear.Name);
// lambda expressions (delegates): the fat arrow occuring inside of parentheses on linq methods; it is a function reference
// the is operator allows us to name something specifically and it returns a boolean expression representing the result
// Any returns true if any one of the thing in the list matches
// Any: one thing must match; as soon as it finds the first of the thing, it stops looking through the list
var anyTinderHearts = careBears.Any(bear => bear is TinderHeart);
Console.WriteLine(anyTinderHearts);
// All returns true if every bear in our list if a TinderHeart
// All: looks until it finds something that doesn't match and then exits out - short circuiting
var allTinderHearts = careBears.All(bear => bear is TinderHeart);
Console.WriteLine(allTinderHearts);
Console.ReadLine();
// when you put in your dot operator, anything with a disc and a down arrow are the linq things
// aggragate is the same concept as JS reduce
// first says find me the first thing in the list and return it
var firstBear = careBears.First();
// entering a parameter gives the method something look for;
// if you ask for something that doesn't exist, it blows up - throws an exception
var firstBearStartingWithT = careBears.First(bear => bear.Name.StartsWith("Te"));
// if you create a list with nothing in it
var otherList = new List <CareBearBase>();
// if you ask for the first thing in a list that doesn't have anything in it, it blows up - throw an exception
var blowsUp = otherList.First();
// FirstOrDefault says find the first thing that matches, or give me the default of carebearbase
// a reference type, like a class, default to null
var works = careBears.FirstOrDefault(bear => bear.Name.StartsWith('W'));
// skip one item and then take 2 items; throws an exception if used on a list of not three things
var skippedGrumpy = careBears.Skip(1).Take(2);
// return the sum of all bear name lengths
var numberOfCharacters = careBears.Sum(bear => bear.Name.Length);
// return the number of the longest one
var max = careBears.Max(bear => bear.Name.Length);
// doing transformations inside for loops is not a good idea; outdated. instead, use a select
// LINQ takes the place of most foreach and for loops
// data transformations - like with select - are super common. get used to it
// order alphabetically
var orderedBears = careBears.OrderBy(bear => bear.BellyBadge);
// you will know something is expensive when it costs you power; micro-optimization; the order of select and where clauses, things like that
// will find anything that has bear in it
var anyBears = careBears.Any();
var doNotDoThis = careBears.Where(bear => bear.Name.StartsWith('T')).Select(bear => bear.Name).Any();
}
static void Main(string[] args)
{
var definitions = new Dictionary <string, List <string> > ();
definitions.Add("martin", new List <string> {
"smart", "strong", "important"
});
Console.WriteLine(string.Join("you is ", definitions["martin"]));
var grumpyBear = new GrumpyBear();
var tenderHeart = new TenderHeart();
var tinderHeart = new TinderHeart();
var careBears = new List <CareBearBase> {
grumpyBear, tenderHeart, tinderHeart
};
foreach (var bear in careBears)
{
bear.Care("Nathan");
bear.Stare();
}
// this is filter?
var namesThatStartWithT = careBears.Where(bear => bear.Name.StartsWith('T'));
// this is map
var careBearName = careBears.Select(bear => bear.Name);
var careBearNamesThatStartWithT = careBears
.Where(bear => bear.Name.StartsWith('T'))
.Select(bear => bear.Name);
// are there any bears at all. do not combine where and any
var anyBears = careBears.Any();
// if there are any matches; finds the first instance and returns/stops
var anyTinderBears = careBears.Any(bear => bear is TinderHeart);
// if every bear in our list is a TinderhEart
var allTinderHearts = careBears.All(bear => bear is TinderHeart);
// find me the first thing in the list and return it;
var firstBear = careBears.First();
// or, I can pass in a boolean expression
var firstBearStartsWithTY = careBears.First(bear => bear.Name.StartsWith("T"));
// this does not work because nothing fits what you are looking for
var blowsUp = careBears.First(bear => bear.Name.StartsWith("T"));
// this returns null because the default value
var works = careBears.FirstOrDefault(bear => bear.Name.StartsWith('W'));
// lists of three with these parameters does not work. skip the first and take the next 2
var skippedGrumpy = careBears.Skip(1).Take(2);
var numberOfCharacters = careBears.Sum(bear => bear.Name.Length);
//var numberOfCharacters2 = careBears.Max(bear => bear.);
var OrderedBears = careBears.OrderByDescending(bear => bear.BellyBadge);
//Bedtime Bear, Birthday Bear, Cheer Bear, Friend Bear, Funshine Bear, Good Luck Bear, Grumpy Bear, Love-a-lot Bear, Tenderheart Bear, and Wish Bear.
}