# Don't do this
model = eval(modelName)

# Use square brackets instead
model = window[modelName]

typeof undefinedVar is "undefined"

Value               Class      Type
----------------------------------------------
"foo"               String     string
new String("foo")   String     object
1.2                 Number     number
new Number(1.2)     Number     object
true                Boolean    boolean
new Boolean(true)   Boolean    object
new Date()          Date       object
new Error()         Error      object
[1,2,3]             Array      object
new Array(1, 2, 3)  Array      object
new Function("")    Function   function
/abc/g              RegExp     object
new RegExp("meow")  RegExp     object
{}                  Object     object
new Object()        Object     object

type = do ->
  classToType = {}
  for name in "Boolean Number String Function Array Date RegExp Undefined Null".split(" ")
    classToType["[object " + name + "]"] = name.toLowerCase()

  (obj) ->
    strType = Object::toString.call(obj)
    classToType[strType] or "object"

# Returns the sort of types we'd expect:
type("")         # "string"
type(new String) # "string"
type([])         # "array"
type(/\d/)       # "regexp"
type(new Date)   # "date"
type(true)       # "boolean"
type(null)       # "null"
type({})         # "object"

if typeof aVar isnt "undefined"
  objectType = type(aVar)

objectType = type(aVar?)

anArray?.push? aValue

new String("foo") instanceof String # true
"foo" instanceof String             # false

class Parent
class Child extends Parent

child = new Child
child instanceof Child  # true
child instanceof Parent # true

anObject = {one: 1, two: 2}
delete anObject.one
anObject.hasOwnProperty("one") # false

aVar = 1
delete aVar
typeof Var # "integer"

aVar = 1
aVar = null

 public int Sum(int a, int b)
{
     return a + b;
}

 public static IEnumerable SomeNumbers()
{
     yield return 3;
     yield return 5;
     yield return 8;
}

static void Main()
{
    foreach (int number in SomeNumbers())
    {
        Console.Write(number.ToString() + " ");
    }
    // Output: 3 5 8
    Console.ReadKey();
}

 public static IEnumerable SomeNumbers()
{
   yield return 3;
   yield return 5;
   yield return 8;
   yeild break;
}

static void Main()
{
  DaysOfTheWeek days = new DaysOfTheWeek();
  foreach (string day in days)
    {
        Console.Write(day + " ");
    }
    // Output: Sun Mon Tue Wed Thu Fri Sat
    Console.ReadKey();
}

public class DaysOfTheWeek : IEnumerable
{
  private string[] days = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
  public IEnumerator GetEnumerator()
    {
        for (int index = 0; index < days.Length; index++)
        {
            // Yield each day of the week. 
            yield return days[index];
        }
    }
}

someObject = { a: 'value for a', b: 'value for b' }
{ a, b } = someObject
console.log "a is '#{a}', b is '#{b}'"

var a, b, someObject;

someObject = {
  a: 'value for a',
  b: 'value for b'
};

a = someObject.a, b = someObject.b;

console.log("a is '" + a + "', b is '" + b + "'");

{join, resolve} = require('path')

join('/Users', 'Vahid')

# Use local alias
$ = jQuery

$ ->
  # DOMContentLoaded
  $(".el").click ->
    alert("Clicked!")

var $;
$ = jQuery;
$(function() {
  return $(".el").click(function() {
    return alert("Clicked!");
  });
});

# Execute function immediately
type = do ->
  classToType = {}
  for name in "Boolean Number String Function Array Date RegExp Undefined Null".split(" ")
    classToType["[object " + name + "]"] = name.toLowerCase()

  # Return a function
  (obj) ->
    strType = Object::toString.call(obj)
    classToType[strType] or "object"

var type;

type = (function() {
  var classToType, i, len, name, ref;
  classToType = {};
  ref = "Boolean Number String Function Array Date RegExp Undefined Null".split(" ");
  for (i = 0, len = ref.length; i < len; i++) {
    name = ref[i];
    classToType["[object " + name + "]"] = name.toLowerCase();
  }
  return function(obj) {
    var strType;
    strType = Object.prototype.toString.call(obj);
    return classToType[strType] || "object";
  };
})();

A basic particle system in F# and WPF 

match_expression [ NOT ] LIKE pattern [ ESCAPE escape_character ]

%[abcde_ ]%

WHERE string_value LIKE '%@[abcde@_ ]%' ESCAPE '@'

WHERE string_value LIKE '%[[]abcde[_] ]%'

WHERE CHARINDEX('[abcde_ ]', string_value) > 0

[[[%^ab'c'de]]]%

declare @t table (s varchar(50))
insert @t values ('[[[%^ab''c''de]]]%'),
('[[[ %^ab''cde]]%'), ('[[%^ab''c''de]]%'),
('[[[%^abc''de]]]%');

var userName = "user 1";
var user = context.Users.FromSql($"select top 1 * from Users where name = {userName} ").FirstOrDefault();
if (user != null)
{
   Console.WriteLine(user.Name);
}

SELECT TOP(1) [u].[UserId], [u].[IsAdmin], [u].[Name]
FROM (
    select top 1 * from Users where name = @p0
) AS [u]

var sql = $"select top 1 * from Users where name = {userName} ";
user = context.Users.FromSql(sql).FirstOrDefault();
if (user != null)
{
   Console.WriteLine(user.Name);
}

 .SqlException: Incorrect syntax near '1'

 public static IQueryable<TEntity> FromSql<TEntity>(this IQueryable<TEntity> source, FormattableString sql) where TEntity : class;

 var sql = $"select top 1 * from Users where name = '{userName}' ";

SELECT TOP(1) [u].[UserId], [u].[IsAdmin], [u].[Name]
FROM (
   select top 1 * from Users where name = 'user 1'
) AS [u]