VSCode snippet: add variable number of objects to a class constructor

Question

I am trying to create a simple snippet that allows me to create JS Constructors. So far, what I have is

"class constructor": {
    "prefix": "class",
    "body": [
        "class ${1:ClassName} {",
            "\t\tconstructor({${2:thisName}: ${2}}) {",
                "\t\t\tthis.${2} = ${2}",
            "\t}",
        "}"
    ],
    "description": "class constructor template"
},

This works as expected, but what I am trying to see if it is possible to add multiple entries which also creates a new line for this, but in this case, the snippet runs its course once I fill in the details for $2{thisName}. What I am hoping for is the ability to add multiple key value pairs.

So instead of it ending at:

class ClassName {
  constructor({ thisName:  thisName}) {
    this. thisName =  thisName
  }
}

I would like to be able to add other items so that it looks like; where a new line for this.another = another is created automatically.

class ClassName {
  constructor({ thisName:  thisName, another: another}) {
    this. thisName = thisName
    this.another = another // this is create
 }

}

The ${3}.. doesn't work here because there could be any amount of items.

Mark · Accepted Answer · 2020-01-07 05:05:15Z

Try this:

"class constructor": {
  "prefix": "class",
  "body": [

    "class ${1:ClassName} {",
          "\t\tconstructor({${2/([^,]+)([,\\s]*|)/$1: $1${2:+, }/g}}) {",
          "${2/([^,]+)([,\\s]*|)/\t\t\tthis.$1 = $1${2:+\n}/g}",
          "\t}",
      "}"
  ],
  "description": "class constructor template"
},

See my answer at Make a vscode snippet that can use a variable number of arguments for more explanation.

You can use any number of arguments in a snippet as long as you capture them in the same regex capture group - here each arg is in capture group $1.

Then each one is replaced! In your case by \t\t\tthis.$1 = $1${2:+\n the second time. After the tabs, the capture group is used in this.$1 = $1

Then capture group 2 is inspected ${2:+\n}. It either has the , or nothing. If it has something, add a \n, otherwise nothing will be added.

For this regex to work you should enter your args as

arg1, arg2, arg3, arg4

-- with comma separators (withor without spaces after the commas). After your last argument hit tab to fire the snippet transform.

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