coalesce

@JvmStatic
fun coalesce(vararg expressions: Expression): Expression
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Evaluates each expression in turn until the first valid value is obtained. Invalid values are null and #types-image expressions that are unavailable in the style. If all values are invalid, coalesce returns the first value listed.

fun coalesce(block: Expression.ExpressionBuilder.() -> Unit): Expression
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DSL function for "coalesce".