javascript - What is [, ... ] in function/method documentation? -


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i have come across type of syntax in node.js. can please explain [, in node.js/javascript?

examples of syntax have seen.

  • assert(value[, message])
  • const name1 = value1 [, name2 = value2 [, ... [, namen = valuen]]];

you're looking @ function definitions in documentation, , you're seeing conventional way show 1 or more parameters optional. not valid javascript syntax.

for example, assert(value[, message]) means value parameter required, message optional. not put assert(value[, message]) in code; trigger syntax error.


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