Question

67

JavaScript function with optional parameters

rated 0 times [ 70] [ 3] / answers: 1 / hits: 23874 / 9 Years ago, mon, december 21, 2015, 12:00:00

I'm new to JavaScript coming from Python background. In Python parameters can be passed as key and value as such:

def printinfo( name, age = 35 ):

   print Name: , name

   print Age , age

   return;

Then the function could be called as such:

printinfo( age=50, name=miki )

printinfo( name=miki )

Can such parameters be passing in JavaScript functions?

I want to be able to pass one or more parameter. For example a JavaScript function as such:

function plotChart(data, xlabel, ylabel, chart_type=l){

    ...

}

I want to be able to pass only data and chart type and labels are optional such as :

plotChart(data, chart_type=pie)

Is this possible with JavaScript?

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george

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3 Years ago

answered 9 Years ago kaitlynnb · Accepted Answer

A good way to do this would be to use an object for all of the arguments. Something like:

function plotChart(options) {

  // Set defaults

  options.chart_type = options.chart_type || '1';



  // Check if each required option is set

  // Whatever is used by the data

}

Then when the function is called:

plotChart({

  data: 'some data',

  xlabel: 'some xlabel',

  ylabel: 'some ylabel',

  chart_type: '5' // This is optional

});