# FlashExtensions
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[](https://codeclimate.com/github/drexed/flash_extensions)
Flash Extensions is a collection of commonly used object helpers in a ruby based project. It currently includes extensions for: arrays, enumerables, hashes, numerics, objects, strings, and time.
`Rails Safe` = methods extracted from rails but that do not override that rails method.
Highly recommended extensions:
* **Hash:** Hashie - https://github.com/intridea/hashie
* **String:** Escape Utils - https://github.com/brianmario/escape_utils
* **String:** Fast Blank - https://github.com/SamSaffron/fast_blank
* **Translation:** Fast Gettext - https://github.com/grosser/fast_gettext
## Installation
Add this line to your application's Gemfile:
gem 'flash_extensions'
And then execute:
$ bundle
Or install it yourself as:
$ gem install flash_extensions
## Usage
### ArrayExtensions
####Remove Blanks:####
Use the `remove_blanks` method removes blank elements from an array.
```ruby
["this", "", "that", nil].remove_blanks #=> ["this", "that"]
"this is a test".split(" ").remove_blanks #=> ["this", "is", "a", "test"]
```
####Remove First Element:####
Use the `remove_first` method removes the first element from an array. Like Array.shift, but returns the array instead of removed the element.
```ruby
["1", "2", "3"].remove_first #=> ["2", "3"]
```
####Remove Last Element:####
Use the `remove_last` method removes the last element from an array. Like Array.pop, but returns the array instead of removed the element.
```ruby
["1", "2", "3"].remove_last #=> ["1", "2"]
```
### EnumerableExtensions
####Drop Last:####
Use the `drop_last` method to drops the last number of elements of a collection.
```ruby
[1,2,3].drop_last(1) #=> [1,2]
[].drop_last(3) #=> []
```
####Drop Last While:####
Use the `drop_last_while` method to drops the last number of elements of a collection while it meets a criteria.
```ruby
[1,2,3].drop_last_while(&:odd?) #=> [1,2]
[].drop_last_while(&:odd?) #=> []
```
####Exactly:####
Use the `excatly?` method to return if there are exactly the number of an element type.
```ruby
[1,2,3].excatly?(3) #=> true
[1,1,3,3].exactly?(2, &:even?) #=> false
[].exactly?(1) #=> false
```
####Frequencies:####
Use the `frequencies` method to return a hash of the number of times a value in an array appears.
```ruby
[1, :symbol, 'string', 3, :symbol, 1].frequencies #=> { 1 => 2, :symbol => 2, 'string' => 1, 3 => 1 }
[].frequencies #=> {}
```
####Max:####
Use the `max` method to return the largest value of a collection of numbers.
```ruby
[2,3,1].max #=> 3
[].max #=> 0
[].max(nil) #=> nil
```
####Min:####
Use the `min` method to return the smallest value of a collection of numbers.
```ruby
[2,3,1].min #=> 3
[].min #=> 0
[].min(nil) #=> nil
```
####Mean:####
Use the `mean` method to return the average of a collection of numbers.
```ruby
[1,2,3].mean #=> 2
[].mean #=> 0
[].mean(nil) #=> nil
```
####Median:####
Use the `median` method to return the middle value of a collection of numbers.
```ruby
[1,2,6].median #=> 2
[1,2,3,6].median #=> 2.5
[].median #=> 0
[].median(nil) #=> nil
```
####Mode:####
Use the `mode` method to return the most frequent value of a collection of numbers.
```ruby
[1,1,2,46].mode #=> 1
[1,2,3].mode #=> nil
[].mode #=> 0
[].mode(nil) #=> nil
```
####Range:####
Use the `range` method to return the difference between the smallest and largest value of a collection of numbers.
```ruby
[1,2,6].range #=> 5
[].range #=> 0
[].range(nil) #=> nil
```
####Several:####
Use the `several?` method to return if there are several types of an element.
```ruby
[1,2,3].several? #=> true
[1,1,3,3].several?(&:even?) #=> false
[].several? #=> false
```
####Sum:####
Use the `sum` method to to return the sum of a collection of numbers.
```ruby
[1,2,3].sum #=> 2
[1,2,3,4].sum #=> 2.5
[].sum #=> 0
[].sum(nil) #=> nil
```
####Take Last:####
Use the `take_last` method to return the last number of elements of a collection.
```ruby
[1,2,3].take_last(2) #=> [2,3]
[].take_last(3) #=> []
```
####Take Last While:####
Use the `take_last_while` method to return the last number of elements of a collection while it meets a criteria.
```ruby
[1,2,3,5].take_last_while(&:odd?) #=> [5, 5]
[].take_last_while(&:odd?) #=> []
```
### HashExtensions
####Except:####
Use the `except` method to return only key/value pairs not matching certain keys.
```ruby
{ foo: 'foo', baz: 'baz', bar: 'bar' }.except(:foo) #=> { baz: 'baz', bar: 'bar' }
{ :foo => 'foo', :baz => 'baz', :bar => 'bar' }.except(:baz, :bar) #=> { :foo => 'foo' }
{}.except(:foo) #=> {}
```
####Only:####
Use the `only` method to return only key/value pairs matching certain keys.
```ruby
{ foo: 'foo', baz: 'baz', bar: 'bar' }.only(:foo) #=> { foo: 'foo' }
{ :foo => 'foo', :baz => 'baz', :bar => 'bar' }.only(:baz, :bar) #=> { :baz => 'baz', :bar => 'bar' }
{}.only(:foo) #=> {}
```
####Rename Keys:####
Use the `rename_keys` and `rename_keys!` method to rename the keys of a hash.
```ruby
{ foo: 'foo', baz: 'baz' }.rename_keys(foo: :bar) #=> { bar: 'foo', baz: 'baz' }
{ foo: 'foo', 'baz' => 'baz' }.rename_keys(foo: :bar, 'baz' => 'tick') #=> { bar: 'foo', tick: 'baz' }
```
####Stringify Keys:####
Use the `stringify_keys` and `stringify_keys!` method to convert the hash keys to strings. `Rails Safe`
```ruby
{ foo: 'foo', 'bar' => 'bar' }.stringify_keys #=> { 'foo' => 'foo', 'baz' => 'baz' }
```
####Symbolize Keys:####
Use the `symbolize_keys` and `symbolize_keys!` method to convert the hash keys to symbols. `Rails Safe`
```ruby
{ foo: 'foo', 'bar' => 'bar' }.symbolize_keys #=> { foo: 'foo', baz: 'baz' }
```
####Symbolize and Underscore Keys:####
Use the `symbolize_and_underscore_keys` and `symbolize_and_underscore_keys!` method to symbolize and underscore keys.
```ruby
{ 'firstName' => 'example', lastName: 'string' }.symbolize_and_underscore_keys #=> { first_name: 'foo', last_name: 'test' }
```
### ObjectExtensions
####Blank:####
Use the `blank?` method on a object to determine if it is empty or nil. `Rails Safe`
```ruby
"".blank? #=> true
"Awesome Sting".blank? #=> false
```
####Present:####
Use the `present?` method on a object to determine if it is not empty or nil. `Rails Safe`
```ruby
"Awesome Sting".blank? #=> true
"".present? #=> false
```
####Numeric:####
Use the `numeric?` method to determine whether an object's to_s value is numeric.
```ruby
"-32.50".numeric? #=> true
"$2.55".numeric? #=> false
```
####Palindrome:####
Use the `palindrome?` method to determine if an object is a palindrome.
```ruby
"racecar".palindrome? #=> true
12321.palindrome? #=> true
"example".palindrome? #=> false
12345.palindrome? #=> false
```
####Try:####
Use the `try` method on a object to try that method with out raising an error. `Rails Safe`
```ruby
"example".try(:upcase) #=> "EXAMPLE"
"example".try(:fake_method) #=> nil
```
### NumericExtensions
####Multiple Of:####
Use the `multiple_of?` method to check if a number is the multiple of another. `Rails Safe`
```ruby
9.multiple_of?(3) #=> true
7.multiple_of?(3) #=> false
```
####Negative:####
Use the `negative?` method to check if a number is negative.
```ruby
-1.negative? #=> true
1.negative? #=> false
```
####Positive:####
Use the `positive?` method to check if a number is positive.
```ruby
1.positive? #=> true
-1.positive? #=> false
```
####To Byte:####
Use the `to_byte` method to convert a byte size from one unit to another unit.
```ruby
1024.to_byte #=> 1 #KB
5120.to_byte(:kb, :mb) #=> 5 #MB
1.to_byte(:mb, :kb) #=> 1024 #KB
80.to_byte(:mb, :gb) #=> 0.1 #GB
```
####To Length:####
Use the `to_length` method to convert a length from one unit to another unit.
```ruby
1.to_length #=> 0.039370078740157 #IN
10.to_length(:mm, :cm) #=> 1 #CM
2.to_length(:mi, :yd) #=> 3520 #IN
```
####To Time Unit:####
Use the `to_time_unit` method to convert a time unit from one unit to another unit.
```ruby
120.to_time_unit #=> 2 #MIN
2.to_time_unite(:day, :sec) #=> 172800 #SEC
```
####To Temperature:####
Use the `to_temperature` method to convert a temperature from one unit to another unit.
```ruby
100.to_temperature #=> 212 #F
212.to_temperature(:f, :c) #=> 100 #C
212.to_temperature(:fahrenheit, :kelvin) #=> 373.15 #K
```
####To Weight:####
Use the `to_weight` method to convert a weight from one unit to another unit.
```ruby
1.to_weight #=> 0.035273961949580004 #OZ
2.to_weight(:kg, :lb) #=> 4.4092452436976 #LB
3.to_weight(:lb, :kg) #=> 1.3607771100000001 #LB
```
### StringExtensions
####Camelize:####
Use the `camelize` and `camelize!` method to transfrom a string to camelcase. `Rails Safe`
```ruby
"example_string".camelize #=> "ExampleString"
"example_string".camelize(:lower) #=> "exampleString"
```
####Ends With:####
Use the `ends_with?` method to determine whether a string ends with a certain value. `Rails Safe`
```ruby
"example string".ends_with?("g") #=> true
"example string".ends_with?("ng") #=> true
"example string".ends_with?("e") #=> false
```
####Starts With:####
Use the `starts_with?` method to determine whether a string starts with a certain value. `Rails Safe`
```ruby
"example string".starts_with?("e") #=> true
"example string".starts_with?("ex") #=> true
"example string".starts_with?("g") #=> false
```
####Humanize:####
Use the `humanize` and `humanize!` method to transform a string to a human readable string. `Rails Safe`
```ruby
"ExampleString".humanize #=> "Example string"
"example_string".humanize #=> "Example string"
```
####Titleize:####
Use the `titleize` and `titleize!` method to capitalize each word in a string. `Rails Safe`
```ruby
"example string".titleize #=> "Example String"
"example_string".titleize #=> "Example String"
"ExampleString".titleize #=> "Example String"
```
####Underscore:####
Use the `underscore` and `underscore!` method to transform a string to snakecase. `Rails Safe`
```ruby
"ExampleString".underscore #=> "example_string"
"exampleString".underscore #=> "example_string"
```
####Domain:####
Use the `domain` method to extract the domain name from a URL.
```ruby
"http://www.example.com/fake-page".domain #=> "www.example.com"
```
####Downcase:####
Use the `downcase?` method to determine if all characters are lowercase.
```ruby
"example".downcase? #=> true
"Example".downcase? #=> false
"EXAMPLE".downcase? #=> false
```
####Upcase:####
Use the `upcase?` method to determine if all characters are uppercase.
```ruby
"EXAMPLE".upcase? #=> true
"example".upcase? #=> false
"Example".upcase? #=> false
```
####Mixcase:####
Use the `mixcase?` method to determine if characters are mixedcase.
```ruby
"Example".mixedcase? #=> true
"EXAMPLE".mixedcase? #=> false
"example".mixedcase? #=> false
```
####Ellipsize:####
Use the `ellipsize` method to truncate a string in the middle.
**Options**
* Length: default to 30
* Offset: default to 4
* Separator: default to "..."
```ruby
"example string".ellipsize #=> "example string"
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".ellipsize #=> "0123...WXYZ"
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".ellipsize(offset: 2, separator: "+++") #=> "01+++YZ"
```
####Nix:####
Use the `nix` and `nix!` method to remove the first instance of a string.
```ruby
"this thing that thing".nix("thing") #=> "this that thing"
```
####GNix:####
Use the `gnix` and `gnix!` method to remove the every instance of a string.
```ruby
"this thing that thing".gnix("thing") #=> "this that "
```
####Pollute:####
Use the `pollute` method to pollute the space between every letter in a string, so it will be exempt from any impending string searches.
```ruby
"test".pollute #=> "t^--^--^e^--^--^s^--^--^t^--^--^"
"test".pollute("-") #=> "t-e-s-t-"
```
####Unpollute:####
Use the `unpollute` to remove the default or custom pollution character. Can also be used to remove an unwanted character.
```ruby
"t^--^--^e^--^--^s^--^--^t^--^--^".unpollute #=> "test"
"t-e-s-t-".unpollute #=> "test"
```
####Slugify:####
Use the `slugify` and `slugify!` method to generate a permalink-style string, with odd characters removed.
```ruby
"example".slugify #=> "example"
"example string".slugify #=> "example-string"
"Example string @@@ test!".slugify #=> "example-string-test"
```
####Strip Tags:####
Use the `strip_tags` and `strip_tags!` method to remove HTML tags from a string.
```ruby
"example".strip_tags #=> "example"
"click".strip_tags #=> "click"
"this is bold and emphatic".strip_tags #=> "this is bold and emphatic"
```
####Strip Whitespace:####
Use the `strip_whitespace` and `strip_whitespace!` method removes tab characters and instances of more than one space.
```ruby
"example string test".strip_whitespace #=> "example string test"
" this \t is also a test ".strip_whitespace #=> "this is also a test"
```
####Truncate Preserving Words:####
Use the `truncate_preserving_words` method to truncate a string while preserving words.
**Options**
* max_words: default to nil
* max_characters: default to 30
* Separator: default to "..."
```ruby
"example string".truncate_preserving_words #=> "example string"
"example string test another1 another2 another3".truncate_preserving_words #=> "example string test another1 ..."
"example string test another1 another2 another3".truncate_preserving_words(max_chars: 10, separator: "+++") #=> "example +++"
```
### TimeExtensions
####Format:####
Use the `format` method on a Date or Time object to format it using a human readable string.
**Rules**
* Characters: a-z 0-9 _
* Characters can only be used to generate a format part
```ruby
Time.now.format("year") #=> "2014"
Time.now.format("month_name day, year hour:minute ampm") #=> "January 09, 2014 02:31 pm"
```
| Name | Key | Equivalent `strftime` | Result |
| --- | --- | --- | --- |
| Month - digits zero-padded | `m` or `month` or `month_zero` | %m | (01..12) |
| Month - digits unpadded | `mm` or `Month` or `month_unpadded` | %-m | (1..12) |
| Month - digits blank-padded | `mmm` or `MONTH` or `day_blank` | %_m | ( 1..12) |
| Month - name | `mmmm` or `month_name` | %B | January |
| Month - name abbreviated | `mmmmm` or `month_name_abbr` | %b | Jan |
| Day - digits zero-padded | `d` or `day` or `day_zero` | %d | (01..31) |
| Day - digits unpadded | `dd` or `Day` or `day_unpadded` | %-d | (1..31) |
| Day - digits blank-padded | `ddd` or `DAY` or `day_blank` | %_d | ( 1..31) |
| Day - digits of the year | `dddd` or `day_of_the_year` | %j | (001..366) |
| Week - starting monday | `wwwww` or `week` | %M | (00..53) |
| Week - starting sunday | `wwwwww` or `weekday_offset` | %M | (00..53) |
| Weekday - starting monday | `w` or `weekday` | %M | (1..7) |
| Weekday - starting sunday | `ww` or `weekday` | %M | (0..6) |
| Weekday - name | `www` or `weekday_name` | %M | Sunday |
| Weekday - name abbreviated | `wwww` or `weekday_name_abbr` | %M | Sun |
| Year - digits two | `yy` or `yr` | %y | (00..99) |
| Year - digits four | `yyyy` or `year` | %Y | 1999 |
| Hour - digits zero-padded | `h` or `hour` or `hour_zero` | %H | (00..23) |
| Hour - digits blank-padded | `hh` or `HOUR` or `hour_blank` | %k | ( 0..23) |
| Hour - digits zero-padded | `hhh` or `hour_imperical` or `hour_imperical_zero` | %I | (01..12) |
| Hour - digits blank-padded | `hhhh` or `HOUR_IMPERICAL` or `hour_imperical_blank` | %l | ( 1..12) |
| Minute - minute | `n` or `minute` | %M | (00..59) |
| Second - second | `s` or `second` | %S | (00..60) |
| Meridian - lowercase | `ampm` or `meridian` | %p | am..pm |
| Meridian - uppercase | `AMPM` or `MERIDIAN` | %P | AM..PM |
| Time Zone - time zone | `z` or `time_zone` | %z | +0900 |
| Time Zone - hour and minute offset | `zz` or `time_zone_offset` | %z | +09:00 |
| Time Zone - hour, minute and second offset | `zzz` or `time_zone_offset_full` | %z | +09:00:00 |
####To Format:####
Use the `to_format` method on a Date or Time object to format it without having to use `strftime` method.
```ruby
Time.now.to_format(:year) #=> "2014"
Time.now.to_format(:datetime) #=> "January 09, 2014 02:31 pm"
```
| Name | Key | Equivalent `strftime` | Result |
| --- | --- | --- | --- |
| Month - digits zero-padded | `:month` or `:month_zero` | %A | (01..31) |
| Month - digits unpadded | `:month_unpadded` | %a | (1..31) |
| Month - digits blank-padded | `:month_blank` | %a | ( 1..31) |
| Month - name | `:month_name` | %A | January |
| Month - name abbreviated | `:month_name_abbr` | %a | Jan |
| Weekday - digits zero-padded | `:Weekday_zero` | %A | (01..12) |
| Weekday - digits unpadded | `:Weekday_unpadded` | %a | (1..12) |
| Weekday - digits blank-padded | `:Weekday_blank` | %a | ( 1..12) |
| Weekday - name | `:weekday_name` | %A | Sunday |
| Weekday - name abbreviated | `:Weekday_name_abbr` | %a | Sun |
| Year - digits two | `:yr` | %y | (00..99) |
| Year - digits four | `:year` | %Y | 1999 |
| Hour - digits zero-padded | `:hour` or `:hour_zero` | %H | (00..23) |
| Hour - digits blank-padded | `:hour_blank` | %k | ( 0..23) |
| Hour - digits zero-padded imperical | `:hour_imperical_zero` | %I | (01..12) |
| Hour - digits blank-padded imperical | `:hour_imperical_blank` | %l | ( 1..12) |
| Minute - minute | `:minute` | %M | (00..59) |
| Second - second | `:second` | %S | (00..60) |
| Time Zone - time zone | `:time_zone` | %z | +0900 |
| Time Zone - hour and minute offset | `:time_zone_offset` | %z | +09:00 |
| Time Zone - hour, minute and second offset | `:time_zone_offset_full` | %z | +09:00:00 |
| Date - name | `:date` | %B %-d, %Y | January 9, 2014 |
| Date - name abbreviated | `:date_abbr` | %b %-d, %Y | Jan 9, 2014 |
| Date - iso | `:date_iso` | %Y-%m-%d | 2014-01-09 |
| Datetime - name | `:datetime` | %B %-d, %Y %H:%M | January 9, 2014 00:31 |
| Datetime - name abbreviated | `:datetime_abbr` | %b %-d, %Y %H:%M | Jan 9, 2014 00:31 |
| Datetime - iso | `:datetime_iso` | %Y-%m-%d %H:%M | 2014-01-09 00:31 |
| Datetime - name imperical | `:datetime_imperical` | %B %-d, %Y %H:%M | January 9, 2014 12:31 am |
| Datetime - name abbreviated imperical | `:datetime_imperical_abbr` | %b %-d, %Y %H:%M | Jan 9, 2014 12:31 am |
| Datetime - iso imperical | `:datetime_imperical_iso` | %Y-%m-%d %H:%M | 2014-01-09 12:31 am |
| Datetime - name time zone | `:datetime_tzn` | %B %-d, %Y %H:%M %Z | January 9, 2014 00:31 UTC |
| Datetime - name abbreviated time zone | `:datetime_abbr_tzn` | %b %-d, %Y %H:%M %Z | Jan 9, 2014 00:31 UTC |
| Datetime - iso time zone | `:datetime_iso_tzn` | %Y-%m-%d %H:%M %z | 2014-01-09 00:31 +0000 |
| Datetime - name imperical time zone | `:datetime_imperical_tzn` | %B %-d, %Y %H:%M %Z | January 9, 2014 12:31 am UTC |
| Datetime - name abbreviated imperical time zone | `:datetime_imperical_abbr_tzn` | %b %-d, %Y %H:%M %Z | Jan 9, 2014 12:31 am UTC |
| Datetime - iso imperical time zone | `:datetime_imperical_iso_tzn` | %Y-%m-%d %H:%M %z | 2014-01-09 12:31 am +0000 |
| Day - name | `:day` | %B %-d | January 9 |
| Day - name abbreviated | `:day_abbr` | %b %-d | Jan 9 |
| Day - iso | `:day_iso` | %m-%d | 01-09 |
| Daytime - name | `:daytime` | %B %-d %H:%M | January 9 00:31 |
| Daytime - name abbreviated | `:daytime_abbr` | %b %-d %H:%M | Jan 9 00:31 |
| Daytime - iso | `:daytime_iso` | %m-%d %H:%M | 01-09 00:31 |
| Daytime - name imperical | `:daytime_imperical` | %B %-d %H:%M | January 9 12:31 am |
| Daytime - name abbreviated imperical | `:daytime_imperical_abbr` | %b %-d %H:%M | Jan 9 12:31 am |
| Daytime - iso imperical | `:daytime_imperical_iso` | %m-%d %H:%M | 01-09 12:31 am |
| Time - zero-padded | `:time` or `:time_zero` | %H:%M | 00:31 |
| Time - blank-padded | `:time_blank` | %k:%M %z | 0:31 |
| Time - with time zone | `:time_tz` | %H:%M %z | 00:31 +0000 |
| Time - with time zone name | `:time_tzn` | %H:%M %Z | 00:31 UTC |
## Contributing
1. Fork it ( http://github.com//flash_extensions/fork )
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Add some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create new Pull Request