I keep coming across this syntax [, everywhere and I'm baffled by its meaning.
d3.mean(array[, accessor])
.on( events [, selector ] [, data ], handler )
Why is there a comma after the opening bracket? What does it signify?
I keep coming across this syntax [, everywhere and I'm baffled by its meaning.
d3.mean(array[, accessor])
.on( events [, selector ] [, data ], handler )
Why is there a comma after the opening bracket? What does it signify?
A comma acts as a divider between different parameters, and square brackets indicate that the parameter is not mandatory.
For example:
.on( events [, selector ] [, data ], handler )
With this syntax, you have multiple choices on how to use the function:
.on(events, handler)
.on(events, selector, handler)
.on(events, selector, data, handler)
This indicates that the arguments are not mandatory.
However, remember that these brackets [] serve as placeholders in the instructions.
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