QGIS/resources/function_help/json/array_to_string

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{
"name": "array_to_string",
"type": "function",
"description": "Concatenates array elements into a string separated by a delimiter using and optional string for empty values.",
"arguments": [
{"arg":"array", "description":"the input array"},
{"arg":"delimiter","optional":true,"default":"','","description":"the string delimiter used to separate concatenated array elements"},
{"arg":"emptyvalue","optional":true,"default":"''","description":"the optional string to use as replacement to empty values"}],
"examples": [ { "expression":"array_to_string(array('1','2','3'),',')", "returns":"'1,2,3'"},
{ "expression":"array_to_string(array('1','','3'),',','0')", "returns":"'1,0,3'"}
]
}