Create a date 4 weeks ago from the current date
// description of your code here
1 2 t = 4.weeks.ago
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Assign a variable a value if it's nil
There is a nifty way to give a variable a value if it's nil
This is useful when you want to assign a value to an array and it's not yet initialized.
1 2 a[i] ||=0
This is useful when you want to assign a value to an array and it's not yet initialized.
