vrl 0.32.0

Vector Remap Language
Documentation 
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{
  "anchor": "join",
  "name": "join",
  "category": "String",
  "description": "Joins each string in the `value` array into a single string, with items optionally separated from one another by a `separator`.",
  "arguments": [
    {
      "name": "value",
      "description": "The array of strings to join together.",
      "required": true,
      "type": [
        "array"
      ]
    },
    {
      "name": "separator",
      "description": "The string separating each original element when joined.",
      "required": false,
      "type": [
        "string"
      ]
    }
  ],
  "return": {
    "types": [
      "string"
    ]
  },
  "examples": [
    {
      "title": "Join array (no separator)",
      "source": "join!([\"bring\", \"us\", \"together\"])",
      "return": "bringustogether"
    },
    {
      "title": "Join array (comma separator)",
      "source": "join!([\"sources\", \"transforms\", \"sinks\"], separator: \", \")",
      "return": "sources, transforms, sinks"
    }
  ],
  "pure": true
}