implement .stringCols()

README.md

@@ -112,6 +112,7 @@ let typedObjs  = parser.typedObjs(csvStr);  // [ {a: 1, b: 2, c: 3}, {a: 4, b: 5
 let typedCols  = parser.typedCols(csvStr);  // [ [1, 4], [2, 5], [3, 6] ]
 
 let stringObjs = parser.stringObjs(csvStr); // [ {a: '1', b: '2', c: '3'}, {a: '4', b: '5', c: '6'} ]
+let stringCols = parser.typedCols(csvStr);  // [ ['1', '4'], ['2', '5'], ['3', '6'] ]
 ```
 
 Nested/deep objects can be re-constructed from column naming via `.typedDeep()`:

dist/uDSV.cjs.js

@@ -362,11 +362,17 @@ function initParser(schema, chunkSize) {
 		return rows => _toCols(_toArrs(rows));
 	});
 
+	const stringCols = gen(initRows, addRows, () => {
+		_toCols ??= genToCols(cols);
+		return _toCols;
+	});
+
 	return {
 		schema,
 
 		stringArrs,
 		stringObjs,
+		stringCols,
 
 		typedArrs,
 		typedObjs,

dist/uDSV.d.ts

@@ -119,6 +119,9 @@ export interface Parser {
 	/** parses to typed columnar arrays */
 	typedCols:  <T extends unknown[] = []>(csvStr: string, onData?: OnDataFn<T>) => T[];
 
+	/** parses to string columnar arrays */
+	stringCols: <T extends string[]  = []>(csvStr: string, onData?: OnDataFn<T>) => T[];
+
 	/**
 	 * starts or continues incremental parsing \
 	 * default parse = stringArrs, default onData = accumulator

dist/uDSV.iife.js

@@ -363,11 +363,17 @@ var uDSV = (function (exports) {
 			return rows => _toCols(_toArrs(rows));
 		});
 
+		const stringCols = gen(initRows, addRows, () => {
+			_toCols ??= genToCols(cols);
+			return _toCols;
+		});
+
 		return {
 			schema,
 
 			stringArrs,
 			stringObjs,
+			stringCols,
 
 			typedArrs,
 			typedObjs,

dist/uDSV.mjs

@@ -360,11 +360,17 @@ function initParser(schema, chunkSize) {
 		return rows => _toCols(_toArrs(rows));
 	});
 
+	const stringCols = gen(initRows, addRows, () => {
+		_toCols ??= genToCols(cols);
+		return _toCols;
+	});
+
 	return {
 		schema,
 
 		stringArrs,
 		stringObjs,
+		stringCols,
 
 		typedArrs,
 		typedObjs,

src/uDSV.mjs

@@ -353,11 +353,17 @@ export function initParser(schema, chunkSize) {
 		return rows => _toCols(_toArrs(rows));
 	});
 
+	const stringCols = gen(initRows, addRows, () => {
+		_toCols ??= genToCols(cols);
+		return _toCols;
+	});
+
 	return {
 		schema,
 
 		stringArrs,
 		stringObjs,
+		stringCols,
 
 		typedArrs,
 		typedObjs,

test/parse.spec.mjs

@@ -445,6 +445,21 @@ test('string objs', (t) => {
     ]);
 });
 
+test('string cols', (t) => {
+    const csvStr = `a,b,c\n1,2,3\n4,,6\n7,NaN,null`;
+
+    let schema = inferSchema(csvStr);
+    let parser = initParser(schema);
+
+    let rows = parser.stringCols(csvStr);
+
+    assert.deepEqual(rows, [
+        ['1', '4', '7'   ],
+        ['2', '',  'NaN' ],
+        ['3', '6', 'null'],
+    ]);
+});
+
 test('typed cols', (t) => {
     const csvStr = `a,b,c\n1,2,3\n4,5,6`;