Arrays

• (1) Write a function that reverse a number.
• (2) Write a function that returns a passed string with letters in alphabetical order.
• (3) Write a function that accepts a string as a parameter and find the longest word within the string.
• (4) Write a function to check whether an input is an array or not.

  console.log( yourFunc('some text!') ); // => false // (not array) 
  console.log( yourFunc([1, 2, 4, 0]) ); // => true  // (array)

• (5) Write a function to get the first "n" elements of an array.

  console.log( yourFunc([1, 2, 3, 4, 5], 3) ); // => [1, 2, 3] 
  console.log( yourFunc([3, 2, 31, 34, 5], 1) ); // => [3]

• (6) Write a function to get the last element of an array.

  console.log( yourFunc([1, 2, 3, 4, 5]) ); // => 5 
  console.log( yourFunc([3, 2, 31, 34, 7]) ); // => 7

• (7) Write a function to join all elements of the array into a string with needed separator.

  console.log( yourFunc(["Hello", "ladies"], " ") ); // => "Hello ladies" 
  console.log( yourFunc([8, 968, 945, 41, 72], "-") ); // => "8-968-945-41-72"

• (8) Write a function to remove duplicate items from an array.

  console.log( yourFunc([1, 2, 4, 5, 2, 3, 5]) ); // => [1, 2, 4, 5, 3] 
  console.log( yourFunc(["Moscow", "Rome", "Paris", "Madrid", "Rome", "Moscow"]) ); // => ["Moscow", "Rome", "Paris", "Madrid"]

• (9) Write a function to sort the following array of objects by title value.

  var books = [
    {title: "Golden gold"},
    {title: "War and sex"},
    {title: "Deep into rip"}
  ];
  console.log( yourFunc(books) ); // => [{title: "Deep into rip"}, {title: "Golden gold"}, {title: "War and sex"}]

• (10) Write a function to merge two arrays and removes all duplicates elements.

  console.log( yourFunc( [1, 2, 3, 4], [2, 3, 4, 5] ) ); // => [1, 2, 3, 4, 5]
  console.log( yourFunc( ["Rome", "Moscow", "Paris"], ["Paris", "Amsterdam", "London"] ) ); // => ["Rome", "Moscow", "Paris", "Amsterdam", "London"]

• (11) Write a function to find an array contains a specific element.

  console.log( yourFunc( [1, 2, 3, 4, 5], 5 ) );          // => true  // 5 is in array so "true"
  console.log( yourFunc( [1, 2, 3, 4, 5], 12 ) );         // => false // 12 isn't in array so "false"
  console.log( yourFunc( ["Rome", "Moscow"], "Rome" ) );  // => true // "Rome" is in array so "true"

Callbacks

• (1) Write a function to pass a 'JavaScript function' as parameter.

Conditions

• (1) Write a function that accept two numbers as parameters and display the larger one

  console.log( yourFunc(3, 12) );   // => 12
  console.log( yourFunc(4, 1) );    // => 4

Loops

• (1) Write a function with a loop that will iterate from 0 to 15. For each iteration, it will check if the current number is odd or even, and display a message to the console.

  console.log( yourFunc() ); // =>    "0 is even"
                             //       "1 is odd" 
                             //       "2 is even"
                             //       ...
                             //       "15 is odd"

• (2) Write a function with a loop to display the title of the each item in array of objects.

  var books = [
    {title: "Golden gold"},
    {title: "War and sex"},
    {title: "Deep into rip"}
  ];
  console.log( yourFunc(books) ); // => "Golden gold"
                                  //    "War and sex"
                                  //    "Deep into rip"

• (3) Write a function with a loop to list the properties of an object.

  var user = {
    name: "Petr",
    age: 17,
    sex: "M"
  };
  console.log( yourFunc(user) );  // => "name"
                                  //    "age"
                                  //    "sex"

Strings

• (1) Write a function to check whether a string is blank or not.

  console.log( yourFunc("") );    // => true // the string is blakn so "true"
  console.log( yourFunc("Wow") ); // => false // the string isn't blank so "false"

• (2) Write a function to split a string and convert it into an array of words.

  console.log( yourFunc("Have a nice day") ); // => ["Have", "a", "nice", "day"]

• (3) Write a function to remove specified number of characters from a string start.

  console.log( yourFunc("How are you man?", 4) );   // => "are you man"
  console.log( yourFunc("The sun goes down", 13) ); // => "down"
  

• (4) Write a function to capitalize the first letter of each word in a string.

  console.log( yourFunc("where is the shift button?") );  // => "Where Is The Shift Button?"
  console.log( yourFunc("under caps lock") );             // => "Under Caps Lock"

• (5) Write a function to truncates a string if it is longer than the specified number of characters. Truncated strings will end with a translatable ellipsis sequence ("...").

  console.log( yourFunc("Hello, my name's Jordan", 5) );  // => "Hello..."
  console.log( yourFunc("Where is my mind?", 11));        // => "Where is my..."

• (6) Write a function to strip leading and trailing spaces from a string.

  console.log( yourFunc(" wow") );  // => "wow"
  console.log( yourFunc(" lol ") ); // => "lol"

• (7) Write a function to find a word within a string.

  console.log( yourFunc("The quick brown fox", "fox")); // => "'fox' was found 1 times"
  console.log( yourFunc("aa, bb, cc, dd, aa", "aa"));   // => "'a' was found 2 times"

Types

• (1) Write a function which accepts an argument and returns the type.

Objects

• (1) Write a function to delete specific property from the following object.

  var user = {
    name: "Anotshak",
    age: 12
  };
  console.log( yourFunc(user, 'age') ); // => {name: "Anotshak"} // property "age" was removed with its value

• (2) Write a JavaScript function to check if an object contains given property.

  var city = {
    name: "Moscow",
    population: Infinity
  };
  console.log( yourFunc(city, "name") );        // => true // city has "title" property so "true"
  console.log( yourFunc(city, "corruption") );  // => false // city hasn't "corruption" property so "false"