What is "~" represent in this JavaScript?

 

This question already has an answer here:

  • What does a tilde do when it precedes an expression? 6 answers

    • It's bitwise NOT : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators

    "take the result of the indexOf lookup, bitwise invert it, then take the logical NOT of that"

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