How to render react components by using map and join?

Question

I have one component which is going to display Array of String. The code looks like this:

React.createClass({
  render() {
     

        this.props         


        
      

Answer 1

If I just want to render a comma-separated array of components, I usually find reduce too verbose. A shorter solution in such cases is

{arr.map((item, index) => (
  
    {index > 0 && ', '}
    
  
))}

{index > 0 && ', '} will render a comma followed by a space in front of all array items except the first one.

If you want to separate the second-to-last item and the last one by something else, say the string ' and ', you can replace {index > 0 && ', '} with

{index > 0 && index !== arr.length - 1 && ', '}
{index === arr.length - 1 && ' and '}