Câu hỏi phỏng vấn Ruby on Rails
Câu hỏi

What is the difference between && , || operators and and, or ?

Câu trả lời

Here is the difference between the &&, || operators and and, or keywords in Ruby on Rails:

&& vs and

The && operator and and keyword are both used for logical AND operations, but they have some differences:

  1. Precedence: && has higher precedence than and, meaning && is evaluated first in an expression. This can lead to different results depending on the order of operations.

  2. Short-circuiting: Both && and and short-circuit, meaning they stop evaluating operands as soon as the result is determined. However, && is more commonly used for this purpose.

  3. Readability: && is more commonly used in Ruby code, as it is more concise and easier to read, especially when used in complex expressions.

|| vs or

The || operator and or keyword are both used for logical OR operations, but they also have some differences:
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