How to use data from two sheets to create a custom Apps Script function

The provided code and explanation outline how to use data from two sheets to create a custom Google Apps Script function called CALC_TOTAL_COST_WITH_TAX. This function calculates the total cost of items based on their categories while considering tax rates. Here's a summary:

getTaxRate(category) Function:

This function retrieves the tax rate for a specific category from a sheet named 'TaxTable' within the active spreadsheet.
The function uses the getActive() method to get the active spreadsheet and fetches the 'TaxTable' sheet using getSheetByName('TaxTable').
It then uses getDataRange() to retrieve the entire range of data in the 'TaxTable' sheet and getValues() to retrieve the values within that range, creating a two-dimensional array called taxTable.
The function initializes the tax variable to 0 and iterates through each row of taxTable. If the category matches, it assigns the corresponding tax rate to the tax variable.
The function returns the value of the tax variable.
The test() function demonstrates the getTaxRate(category) function's usage by logging the tax rate for a specific category.
Custom Formula Calculation (CALC_TOTAL_COST_WITH_TAX):

This custom formula calculates the total cost of items based on their categories, with different tax rates applied to each category.
The CALC_TOTAL_COST_WITH_TAX function takes item details including item name, quantity, price, and category as arguments.
Within the function, it uses the getTaxRate(category) function to obtain the tax rate associated with the provided category.
The subtotal for the item is calculated by multiplying quantity and price.
The total cost for the item is then calculated by adding the tax amount (obtained by multiplying the subtotal by the tax rate) to the subtotal.
The function returns the calculated total cost for the item.
Using the Custom Formula in Google Sheets:

In a cell where you want the total cost to appear (e.g., cell E6), enter the formula =CALC_TOTAL_COST_WITH_TAX(item, qty, price, cat) to calculate the total cost for a specific item.
In summary, the code showcases how to leverage Google Apps Script to calculate the total cost of items considering tax rates from a separate table. The custom formula CALC_TOTAL_COST_WITH_TAX integrates the getTaxRate(category) function to efficiently calculate costs for each item based on their categories.
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