Extract Function (outside of class) (C++, JS)

• Apr 10, 2019

Moves selected code into a new function within the enclosing namespace.

Purpose

Extract Function (outside of class) (C++, JS) is great when you need to turn a big, complex method into smaller, simpler ones. Small methods are much easier to maintain and encourage code reuse.

Availability

Available from the context menu or via shortcuts:

• when one or more statements are selected.
• when an expression is selected.

Using the Intelligent Paste feature:

• When a qualifying code block is cut from a method and pasted outside, it will be automatically converted into a function, and a call to that function will be added to the location the code was cut from.

Notes

• This refactoring is similar to Extract Method in functionality.

Example

CPP

int TotalPrice(ProductInfo info)
{
    bool a = info.count > 10;
    if (a)
        info.unitPrice = 50;
    else 
        info.unitPrice = 70;
    return info.unitPrice * info.count;
}

Result:

CPP

int TotalPriceExtracted(ProductInfo &info, bool a)
{
    if (a)
        info.unitPrice = 50;
    else
        info.unitPrice = 70;
    return info.unitPrice * info.count;
}
int TotalPrice(ProductInfo info)
{
    bool a = info.count > 10;
    return TotalPriceExtracted(info, a);
}

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