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Casting multiple columns

The data table from the previous exercise, gdp_oceania, is available in your workspace. Your goal is to create a wide format data table, splitting both the "gdp" and "population" columns by the "year" column.

This exercise is part of the course

Joining Data with data.table in R

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Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Split the gdp and population columns by year
___(gdp_oceania, formula = ___, value.var = ___)
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