Basic completion provides a list of all symbols available at the current caret position.

The list will include the usual mix of type, interface, and method names, keywords, and also Live Templates.

Symbols from not-yet-imported packages are also offered, with autoimport on-the-fly when you select them.

How to use:

Basic completion pops up as you start typing code and GoLand recognizes an opportunity to complete something for you, but you can invoke it anytime by pressing ⌃␣ (macOS) / Ctrl+Space (Windows/Linux).

Pro tip:

Basic Code Completion is also available for non-English symbols.

Smart code completion narrows down the matches to quickly give you a list of useful values.

Smart Code Completion gives you a list of the most relevant symbols that are applicable in the current context.

How to use:

Press ⌃⇧␣ (macOS) / Ctrl+Shift+Space (Windows/Linux).

Cyclic Expand Word helps you complete any word any from the current open files

It's a type of code completion that analyzes your code in the visible scope, helps you to complete any word from any of the currently opened files, and provides you with suggestions from the current context, which can save you plenty of time when, for example, you are working on boilerplate code.

How to use:

Press ⌥⏎ (macOS) / Alt+Enter (Windows/Linux) to search for matching words before the caret or choose Code | Completion | Cyclic Expand Word.

Press ⌥⇧/ (macOS) / Shift+Alt+/ (Windows/Linux) for searching words after the caret or choose Code | Completion | Cyclic Expand Word (Backward).

Pro tip:

Hold the ⌥ (macOS) / Alt (Windows/Linux) key down and keep pressing / until you get to the word you need.

Method-like completion for functions allows you to search for functions based on their first parameter.

Imagine you are new to Go and want to split a string.

You know that there must be a function for that, most likely it's called Split and accepts a string as the first argument, but you don't know the exact name of the function and its package.

Here's where method-like completion comes in handy, offering you a list of all suitable functions, automatically importing it upon selection.

How to use:

Hold down the Ctrl key and press Space twice.

Postfix Completion lets you transform an expression into another one, based on the postfix you specify after the dot, the current context, and the expression type.

For example, you can turn a bool expression into an if statement, or create a pointer to an expression. If anything goes not as planned, everything can be reverted via simple ⌘Z (macOS) / Ctrl+Z (Windows/Linux).

How to use:

Open the Postfix Completion page via Settings/Preferences | Editor | General to see the complete list of supported templates.

Pro tip:

Postfix Completion options are displayed as a part of the Basic Completion suggestions list. Press Ctrl+J on Windows/Linux, or ⌘J</kbd on macOS to see a full list of the Postfix Completion templates applicable in the current context.
• You can change the names of all Postfix Completions in the Settings/Preferences dialog.
• In the same dialog, you can also disable the templates you don't need, or even turn off Postfix Completion completely.

Live Templates are great for reducing the time you spend writing frequently used portions of code, like variable and loop declarations, or test functions.

You can edit, rename, turn off, or remove any of the predefined Live Templates, and even add your own.

How to use:

Open Settings/Preferences | Editor | Live Templates to see the full list of already supported templates.

GoLand can complete statements and add required trailing commas for any composite literals (like struct, slice, etc.), and even place caret in a position where you can just start typing the next statement.

How to use:

After typing parentheses, trigger the Complete Current Statement action, ⌃⇧⏎ (macOS) / Ctrl+Shift+Enter (Windows/Linux), to add curly braces and move ethe cursor down to the beginning of the next row.

GoLand provides completion suggestions when you typed only a part of a word (any part, even characters from somewhere in the middle).

Also, case-insensitive CamelHump completion is supported, so you can just type the capital letters along with a number of subsequent characters. For example, type ReWrCl to get io.ReadWriteCloser.

How to use:

Works automatically, you don't have to do anything.

Have a function with lots of arguments? Or a struct with many fields? Parameter Info gives just the basics without using lots of real estate.

How to use:

Press ⌘P (macOS) / Ctrl+P (Windows/Linux) to invoke this feature.

Pro tip:

With your cursor in the parentheses, invoke Parameter Info. You get a tiny popup with the positional and keyword arguments, along with any default values. Bold is used to mark the current spot in the parameter list that your cursor is at.

You can invoke this before you type any parameters, after you've typed a few, or later if you come back to make a change.

GoLand provides code completion suggestions for all modules in the modules cache as you type.

Even if a module has never been imported and used in your project, GoLand is still aware of it and will take care of you.

How to use:

Completion will work automatically as you start typing a package name.

You got it right, debugger also has code completion! GoLand provides suggestions list when you evaluate the state of your application in a debugging session.

How to use:

As you start typing in the Evaluate Expression, Watches or Conditional Breakpoints dialogs, code completion will appear immediately.

When you're editing Run/Debug Configurations, code completion will automatically appear to help you, for example, type a package name.

How to use:

As you start typing in the Package, File, or Directory inputs, the IDE will assist you.

This will overwrite the identifier at the caret, making it easy to quickly replace identifiers in code.

How to use:

Use the ⇥ (macOS) / Tab (Windows/Linux) instead of ⏎ (macOS) / Enter (Windows/Linux) to accept a suggestion from list.

GoLand provides code completion and analysis in injected strings for SQL and databases statements, JavaScript, CSS, HTML, XML, and RegExp, etc.

How to use:

Place the cursor within the literal (between the quotation marks) and press ⌃⏎ (macOS) / Ctrl+Enter (Windows/Linux), select Inject language or reference, choose which one of supported injection language you want to use and start typing, auto-completion will appear instantly.

Exclude undesired imports from being automatically imported or added to completion list.

How to use:

In Settings/Preferences | Go | Imports you can add as many as you want import statements that will be excluded from code completion and auto-import.