as the title says...

git switching branches doesn't make you loose your uncommitted changes

yasi8h@yas-mbp:fusionweb$ git st
# On branch yasith
# Changed but not updated:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#	modified:   config/environment.rb
#	modified:   config/environments/development.rb
#	modified:   config/initializers/devise.rb
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	.idea/
#	nbproject/
no changes added to commit (use "git add" and/or "git commit -a")
yasi8h@yas-mbp:fusionweb$ git branch
  list
  master
* yasith
yasi8h@yas-mbp:fusionweb$ git branch new_branch
yasi8h@yas-mbp:fusionweb$ git checkout new_branch
M	config/environment.rb
M	config/environments/development.rb
M	config/initializers/devise.rb
Switched to branch 'new_branch'
yasi8h@yas-mbp:fusionweb$ git st
# On branch new_branch
# Changed but not updated:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#	modified:   config/environment.rb
#	modified:   config/environments/development.rb
#	modified:   config/initializers/devise.rb
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	.idea/
#	nbproject/
no changes added to commit (use "git add" and/or "git commit -a")