エディタ・IDE

あるべき機能

Read/Write Assistant

Syntax highlight
Code Complete
Auto Close
Comment out, Uncomment

Code Assistant

LSP
Code Jump
Type Info
Emmet/Snippets
Code Generator(Template)

External tool integration

Debugger
Builder, Task Runner
VCS
Terminal

Quality Control

Lint, Style Check
Static Analysis
Code Format

etc

Intelligent Search(FuzzyFinder)
Command Mode
Split Window
Older cursor position/Newer cursor position
Customizable keybinds
Plugin