Vim Text Object

http://blog.carbonfive.com/2011/10/17/vim-text-objects-the-definitive-guide/

Plaintext Text Objects

Vim provides text objects for the three building blocks of plaintext: words, sentences and paragraphs.

Words

aw – a word (includes surrounding white space)
iw – inner word (does not include surrounding white space)
daw - delete word

Sentences

as – a sentence
is – inner sentence
cis - change sentence

Paragraphs

ap – a paragraph
ip – inner paragraph
dap - delete paragraph

Strings

a” – a double quoted string
i” – inner double quoted string
a’ – a single quoted string
i’ – inner single quoted string
a` – a back quoted string
i` – inner back quoted string

Parentheses

a) – a parenthesized block
i) – inner parenthesized block
da) - delete block
Both of these text objects are also available as ab and ib
c% is equivalent to ca)

Brackets

a] – a bracketed block
i] – inner bracketed block
di] - delete block

Braces

a} – a brace block
i} – inner brace block
di} - delete block
Both of these text objects are also available as aB and iB
Again, the % movement can also be with {}

Markup Language Tags

at – a tag block
it – inner tag block
cit - replace tag content

a> – a single tag
i> – inner single tag
di> - replace tag


CamelCaseMotion

CamelCaseMotion provides a text object to move by words within a camel or snake-cased word.
i,w – inner camel or snake-cased word
ci,w - delete word within 

VimTextObj

VimTextObj provides a text object for function arguments.
aa – an argument
ia – inner argument

foo(42, bar(5), 'hello');
cia
foo(42, , 'hello');

Indent Object

Indent Object provides a text object based on indentation level. This script is aimed at programming languages that use significant whitespace to delimit code blocks, e.g., Python, CoffeeScript, because its text object does not include the line after the last line of the indentation level.
ai – the current indentation level and the line above
ii – the current indentation level excluding the line above

def foo():
  if 3 > 5:
    return True
  return "foo"

dai   (cursor on return)

def foo():
  return "foo"

Ruby Block

Ruby Block provides a text object based on a Ruby block, i.e., any expression that is closed with the end keyword.
ar – a Ruby block
ir – inner Ruby block
hash.each do |key, value|
  puts key
  puts value
end

cir (cursor on puts)

hash.each do |key, value|
   
end