Ruby logical operators [duplicate]

This question already has answers here: 开发者_C百科 Closed 12 years ago.

Possible Duplicate:

Is there any wisdom behind “and”, “or” operators in Ruby ?

What is the difference, if any, between the following pairs of logical operators?

1. && vs. and
2. || vs. or

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The "word" versions have lower precedence than the "symbol" versions. In fact, they have even lower precedence than assignment.