Better Sheets

class SpreadsheetApp method .getLastColumn()

SpreadsheetApp is the Apps Script service.

.getLastColumn() is the method name you will see after a dot in your code.

What it does

Returns the column number of the last column that has content.

Why it's used

Detect how wide a table is before looping across columns.
Know where to write the next new field without hardcoding column letters.

Common errors

Forgetting parentheses on getLastColumn. Write SpreadsheetApp.getLastColumn(), not SpreadsheetApp.getLastColumn or getLastColumn by itself.
Skipping dots between chained calls. Each step needs a dot, like SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Data').getLastColumn().
Adding spaces where they do not belong. Write SpreadsheetApp.getLastColumn(), not SpreadsheetApp .getLastColumn(), SpreadsheetApp.getLastColumn (), or SpreadsheetApp . getLastColumn().
Wrong capitalization. Use SpreadsheetApp and getLastColumn, not spreadsheetapp or getlastcolumn.

Official Google docs

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Related methods

.getLastRow()
Returns the row number of the last row that has content.
.getColumn()
Returns the starting column index of a range.
.getMaxColumns()
Returns the total number of columns the sheet can hold.
.getNumColumns()
Returns how many columns are in a range.
.getRow()
Returns the starting row index of a range.

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