Value ' read all the values at once from the Excel grid, put into an array For Irow = LBound (DataRange, 1 ) To UBound (DataRange, 1 ) ' Get the number of rows. Sub WorkWithArrayExample ( ) Dim DataRange As Variant Dim Irow As Long Dim Icol As IntegerĭataRange = ActiveSheet.
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This accesses Range only twice, whereas a loop would access it 20 times for the read/writes. In this example we read in an entire Range object into an array, square each number in the array, and then return the array back to the Range. Often, best performance is achieved by avoiding the use of Range as much as possible. Office Blog - Excel VBA Performance Coding Best Practices (opens new window) `ReDim ar() 'creates new array "ar" - "ReDim ar()" acts like "Dim ar()"` You can use the ReDim statement to declare an array implicitly withinīe careful not to misspell the name of the array when you use the ReDim statementĮven if the Option Explicit statement is included in the module, a new array will be created **Note on Option Explicit and Arrays** ( Declaring a Dynamic You will obtain an error message indicating precisely the error with myvariable : With Option Explicit enabled, any unrecognized words will cause a compile error to be thrown, indicating the offending line. Without Option Explicit enabled, any unrecognized word will be assumed by the VBA compiler to be a new variable of the Variant type, causing extremely difficult-to-spot bugs related to typographical errors. Option Explicit requires that every variable has to be defined before use, e.g.
Excel vba on error goto 0 code#
the code of Sheet1 before activating the option "Require Variable Declaration", Option Explicit will not be added! Small note: This is true for the modules, class modules, etc. Selecting this option will automatically put Option Explicit at the top of every VBA module. Then in the "Editor" tab, make sure that "Require Variable Declaration" is checked: In the VBA Editor window, from the Tools menu select "Options": # VBA Best Practices # ALWAYS Use "Option Explicit" Avoid re-purposing the names of Properties or Methods as your variables.
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WorksheetFunction object executes faster than a UDF equivalent.
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