eloquent javascript correlation tableFor explanation

Question

I am taking my first steps in programming and i am stuck with this problem from eloquent, in particular with the weresquirrel problem. Here it goes :

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Answer 1

I was also confused with the following:

if (entry.events.includes(event)) index += 1;

if (entry.squirrel) index += 2;

table[index] += 1;

This actually means: if (entry.events.includes(event)) index += 1; === true, add 1 to index. In that case, we can translate it as table[1] += 1

And if below is true as well,

if (entry.squirrel) index += 2;

then: table[3] += 1

table[3]is populated only if squirrel and entry=== true

if (entry.squirrel) index += 2is increased by 2 because squirrelis true in table[2].

table[index] is actually just an index we want to use as a target.