Why is SpreadsheetApp.flush() Important for Google Apps Script?

Understanding the Role of SpreadsheetApp.flush()

SpreadsheetApp.flush() is a crucial function in Google Apps Script that enables programmers to ensure that changes made to a spreadsheet are immediately implemented. Without this function, operations may be cached and bundled, leading to inconsistencies in the data.

Layman's Explanation of SpreadsheetApp.flush()

Imagine counting apples on a tree and writing the numbers down one by one. This is equivalent to using flush() within a loop, as you are writing to the paper immediately after each count. However, an optimized approach would be to count several apples before writing them down. This reduces the number of writes, improving performance.

Example of SpreadsheetApp.flush() Usage

Consider the following code:

function updateSpreadsheet() {
  const sheet = SpreadsheetApp.getActiveSheet();
  for (let i = 0; i < 100; i++) {
    sheet.getRange(i, 1).setValue(i + 1);
    SpreadsheetApp.flush();
  }
}

In this example, flush() is used within the loop to ensure that each value is written to the spreadsheet immediately after being set. This guarantees that the user can see the updated data as the script executes.

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