vrl 0.32.0

Vector Remap Language
Documentation 
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{
  "anchor": "is_string",
  "name": "is_string",
  "category": "Type",
  "description": "Check if `value`'s type is a string.",
  "arguments": [
    {
      "name": "value",
      "description": "The value to check if it is a string.",
      "required": true,
      "type": [
        "any"
      ]
    }
  ],
  "return": {
    "types": [
      "boolean"
    ],
    "rules": [
      "Returns `true` if `value` is a string.",
      "Returns `false` if `value` is anything else."
    ]
  },
  "examples": [
    {
      "title": "Valid string",
      "source": "is_string(\"a string\")",
      "return": true
    },
    {
      "title": "Non-matching type",
      "source": "is_string([1, 2, 3])",
      "return": false
    },
    {
      "title": "Boolean",
      "source": "is_string(true)",
      "return": false
    },
    {
      "title": "Null",
      "source": "is_string(null)",
      "return": false
    }
  ],
  "pure": true
}