collapse all function in vs code code example

Example 1: collapse all code vscode

Use :
Ctrl + K + 0 to fold all 
Ctrl + K + J to unfold all

Example 2: visual studio code collapse all

// Fold
Ctrl + K + 0 // fold everything that could be folded
Ctrl + K + 1 // fold just the main branches

// Unfold
Ctrl + K + J // unfold everything