How to understand this slice()?

What does the following slice do in javascript?

str.slice(0, num > 3 ? num - 3 : num)

Copyright Notice：Content Author:「Jing Cheng」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/40901268/how-to-understand-this-slice

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