CODEWITHSUNDEEP
javascriptbabeljs
Paul Whipp
Paul Whipp

Reputation: 16521

Why can't I use javascript array rest destructuring both ways?

I've been using and loving babel (6.5.2) for a while now and find the new destructuring syntax great for writing clearer JavaScript.

Why doesn't the rest destructuring work (it generates a token error) anywhere in the array? For example:

          const [column, ...restOfColumns] = columns;
          const objProps = column.valueChain.slice(0, -1);
          const prop = column.valueChain[column.valueChain.length - 1];
          //const [...objProps, prop] = column.valueChain

The commented out line would replace the preceding two lines with something much easier to read and understand.

Upvotes: 1

Views: 114

Answers (1)

ChrisG
ChrisG

Reputation: 2948

The simple answer is that when you use the destructing syntax ..., it means everything else. Therefore when you try [...objProps, prop], it doesn't know what to assign to prop as you have assigned all values already to objProps

Upvotes: 4

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