able to configure as function

papaparse.js

@@ -426,6 +426,10 @@
 			this._isAllDynamic = true;
 			return;
 		}
+		else if (typeof config === 'function')
+		{
+			this._isIncluded = config;
+		}
 		else if (!config)
 		{
 			return;
@@ -456,6 +460,10 @@
 	DynamicTypingConfig.prototype.constructor = DynamicTypingConfig;
 	DynamicTypingConfig.prototype.isIncluded = function(field)
 	{
+		if (typeof this._isIncluded === 'function')
+		{
+			return this._isIncluded(field);
+		}
 		return this._isAllDynamic || this._columnConfig[field] === true || (this._isBlackListOnly && this._columnConfig[field] !== false)
 	};
 

tests/test-cases.js

@@ -720,6 +720,15 @@ var PARSE_TESTS = [
 			errors: []
 		}
 	},
+	{
+		description: "Dynamic typing by indices can be determined by function",
+		input: '001,002,003',
+		config: { dynamicTyping: function(field) { return (field % 2) === 0; } },
+		expected: {
+			data: [[1, "002", 3]],
+			errors: []
+		}
+	},
 	{
 		description: "Dynamic typing can be applied to `__only` headers",
 		input: 'A,B,C\r\n001,002,003',
@@ -747,6 +756,15 @@ var PARSE_TESTS = [
 			errors: []
 		}
 	},
+	{
+		description: "Dynamic typing by headers can be determined by function",
+		input: 'A_as_int,B,C_as_int\r\n001,002,003',
+		config: { header: true, dynamicTyping: function(field) { return /_as_int$/.test(field); } },
+		expected: {
+			data: [{"A_as_int": 1, "B": "002", "C_as_int": 3}],
+			errors: []
+		}
+	},
 	{
 		description: "Blank line at beginning",
 		input: '\r\na,b,c\r\nd,e,f',