Casting to an Integer

"123.50".to_i     #=> 123
Integer("123.50") #=> 123

A string will take the value of any integer at its start, but will not take integers from anywhere else:

"123-foo".to_i # => 123
"foo-123".to_i # => 0

However, there is a difference when the string is not a valid Integer:

"something".to_i     #=> 0
Integer("something") # ArgumentError: invalid value for Integer(): "something"

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