Why is SpreadsheetApp.flush() Crucial for Real-Time Execution in Google Apps Script?

Understanding the Importance of SpreadsheetApp.flush()

In Google Apps Script, SpreadsheetApp.flush() is an essential method that aids in ensuring the execution of functions in real-time. To comprehend its utility, let's delve into the concept of function bundling.

Apps Script may automatically optimize code by bundling multiple operations together to enhance performance. While this optimization technique generally proves beneficial, there are instances where you may prefer to execute functions immediately to ensure desired outcomes.

Purpose and Function of flush()

The SpreadsheetApp.flush() method exists to fulfill precisely this need. By invoking flush(), programmers can force the spreadsheet engine to carry out pending changes, ensuring that previous code's output and effects are immediately reflected in the spreadsheet.

Consider the following example:

// Without flush()
function countApplesWithoutFlush() {
  const sheet = SpreadsheetApp.getActiveSheet();
  for (let i = 1; i <= 100; i++) {
    const cell = sheet.getRange(`A${i}`);
    cell.setValue(i);
  }
}

In this scenario, the code loops through 100 cells, reading the current value and incrementing it by 1 before setting it back into the cell. However, since flush() is not used, the setValue() operations are bundled together and may not be executed until the loop has completed.

// With flush()
function countApplesWithFlush() {
  const sheet = SpreadsheetApp.getActiveSheet();
  for (let i = 1; i <= 100; i++) {
    const cell = sheet.getRange(`A${i}`);
    cell.setValue(i);
    SpreadsheetApp.flush();
  }
}

By incorporating flush() within the loop, we guarantee that the cell value is written to the spreadsheet immediately after each increment, providing a real-time update to the user.

Therefore, using SpreadsheetApp.flush() offers precise control over the execution of code, ensuring that critical operations or data updates are carried out promptly, without relying on the potential optimizations performed by Apps Script.

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