how to find a word from vscode files code example

Example 1: How do I find and replace all occurrences (in all files) in Visual Studio Code?

Ctrl+Shift+H

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)
)