How can I pass a function to run to a function? - google-apps-script

Question

I have to check weather a certain property exists before I can run the function listed in the add-on menu for a google spreadsheet. Rather than creating a copy of the same check for each function I would like to create a single function that I can pass the function to run as a parameter. How can I do this?
Below is my non functioning test code, but you may get the idea.
function testRun(){
//in practicality this would be an add-on menu
test1Check('test1()');
}
function test1(){
Logger.log("Function Ran");
}
function test1Check(functionToRun){
var labels = PropertiesService.getDocumentProperties().getProperty('labels');
var ui = SpreadsheetApp.getUi(); // Same variations.
if (!labels) {
var result = ui.alert(
'You have not yet set up the page for gClassFolders',
'Would you like to do this now?',
ui.ButtonSet.YES_NO);
// Process the user's response.
if (result == ui.Button.YES) {
// User clicked "Yes".
setupGCF();
}
}
else {
functionToRun;
}
}

Answer 1

I had to remove the () from the parameter sent, and add () to the variable in the function.
function testRun(){
test1Check(test1);
}
function test1(){
Logger.log("Function Ran");
}
function test1Check(functionToRun){
var labels = PropertiesService.getDocumentProperties().getProperty('labels');
var ui = SpreadsheetApp.getUi(); // Same variations.
if (!labels) {
var result = ui.alert(
'You have not yet set up the page for gClassFolders',
'Would you like to do this now?',
ui.ButtonSet.YES_NO);
// Process the user's response.
if (result == ui.Button.YES) {
// User clicked "Yes".
setupGCF();
}
}
else {
functionToRun();
}
}