What is the meaning of syntactical parameter written in javascript documentation

Question

As I'm going through the javascript documentation i seet that in syntax section i see that call([thisObj[, arg1[, arg2[, [, argN]]]]])

can any one explain why is this written [thisObj[ with open squire bracket starting and closed with open squire bracket.

Similarly arg1[, arg2[, [, argN]]]]]

Thanks in advance

You mean you're seeing this in the documentation, right? – Alexander Nied Mar 21 '18 at 15:38 — Alexander Nied, Mar 21 '18 at 15:38

score 1 · Accepted Answer · answered Mar 21 '18 at 15:39

It represents an optional argument.

i.e.

thisObj is optional.

arg1 is optional, but if you provide it then thisObj is mandatory.

arg2 is optional, but if you provide it then arg1 is mandatory.

…and then the [, argN] just means you can keep going for any number of arguments.

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