edit all cells at once like vscode cmd D in excel mac code example

Example 1: vs code edit multi line

Windows: Ctrl + Alt + Arrow Keys.
Linux: Shift + Alt + Arrow Keys.
Mac: Opt + Cmd + Arrow Keys.

Example 2: vscode search in folder

concatMap(rootTemplate =>
  this.templateEngine.getAllChildTemplates(rootTemplate).pipe(
    map(childTemplates => [rootTemplate, childTemplates])
  )
),
concatMap(([rootTemplate, childTemplates]) => 
  this.templateEngine.createTemplateToRender(childTemplates, rootTemplate)
)