15th Week of 2022

Computer Science⚑

GNULinux⚑

Basics⚑

• New: Get command output or default value if emtpy.

  echo | sed 's/^$/default value/'
  

Git⚑

• New: Modify specific commit message.

  git rebase --interactive '<commit-id>^'
  

  Then replace pick with r and save to modify the commit message.

neovim⚑

• New: Search for visual selection.

  vnoremap // y/\V<C-R>=escape(@",'/\')<CR><CR>
  

  To use the mapping, visually select the characters that are wanted in the search, then type // to search for the next occurrence of the selected text.

sed⚑

• New: Use matched pattern.

  echo "foobarbaz" | sed 's/^foo\(.*\)baz$/\1/'
  

  Returns bar.

Programming⚑

basics⚑

• New: Types in the Closure Type System.

  • Types in the Closure Type System

JSDoc⚑

• New: JSDoc @example.

  `javascript /** * Solves equations of the form a * x = b * @example * // returns 2 * globalNS.method1(5, 10); * @example * // returns 3 * globalNS.method(5, 15); * @returns {Number} Returns the value of x for the equation. */ globalNS.method1 = function (a, b) { return b / a; };

• New: JSDoc @type.

  Reference: Use JSDoc: @type.

Basics⚑

• New: Check syntax without running.

  Try to compile it:

  python -m py_compile script.py