openeo-processes/first.json at master · Open-EO/openeo-processes · GitHub

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{
    "id": "first",
    "summary": "First element",
    "description": "Gives the first element of an array.\n\nAn array with solely no-data values returns the no-data value (or `null`).",
    "categories": [
        "arrays",
        "reducer"
    ],
    "parameters": [
        {
            "name": "data",
            "description": "An array with elements of any data type.",
            "schema": {
                "type": "array",
                "items": {
                    "description": "Any data type is allowed."
                }
            }
        },
        {
            "name": "ignore_nodata",
            "description": "Indicates whether no-data values are ignored or not. Ignores them by default. If set to `false`, the first value of the array is returned regardless of whether it is a no-data value or not. For the default value `true`, the first non-no-data value is returned.",
            "schema": {
                "type": "boolean"
            },
            "default": true,
            "optional": true
        }
    ],
    "returns": {
        "description": "The first element of the input array.",
        "schema": {
            "description": "Any data type is allowed."
        }
    },
    "examples": [
        {
            "arguments": {
                "data": [
                    1,
                    0,
                    3,
                    2
                ]
            },
            "returns": 1
        },
        {
            "arguments": {
                "data": [
                    null,
                    "A",
                    "B"
                ]
            },
            "returns": "A"
        },
        {
            "arguments": {
                "data": [
                    null,
                    2,
                    3
                ],
                "ignore_nodata": false
            },
            "returns": null
        }
    ]
}