[Solved] What is the 2nd param in indexOf(a,b) in JavaScript

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The first parameter is the value to be found.

The second parameter is the starting index.

So:

indexOf(2, 3)

Means find the first occurrence of 2 starting at index 3.

The link provided by @Roko shows some useful examples of this with some additional detail.

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solved What is the 2nd param in indexOf(a,b) in JavaScript