refactor: reduce code duplication

Author: kgryte

lib/node_modules/@stdlib/strided/base/smap2/lib/main.js

@@ -18,6 +18,12 @@
 
 'use strict';
 
+// MODULES //
+
+var stride2offset = require( '@stdlib/strided/base/stride2offset' );
+var ndarray = require( './ndarray.js' );
+
+
 // MAIN //
 
 /**
@@ -47,35 +53,7 @@
 * // => <Float32Array>[ 2.0, 4.0, 6.0, 8.0, 10.0 ]
 */
 function smap2( N, x, strideX, y, strideY, z, strideZ, fcn ) {
-	var ix;
-	var iy;
-	var iz;
-	var i;
-	if ( N <= 0 ) {
-		return z;
-	}
-	if ( strideX < 0 ) {
-		ix = (1-N) * strideX;
-	} else {
-		ix = 0;
-	}
-	if ( strideY < 0 ) {
-		iy = (1-N) * strideY;
-	} else {
-		iy = 0;
-	}
-	if ( strideZ < 0 ) {
-		iz = (1-N) * strideZ;
-	} else {
-		iz = 0;
-	}
-	for ( i = 0; i < N; i++ ) {
-		z[ iz ] = fcn( x[ ix ], y[ iy ] );
-		ix += strideX;
-		iy += strideY;
-		iz += strideZ;
-	}
-	return z;
+	return ndarray( N, x, strideX, stride2offset( N, strideX ), y, strideY, stride2offset( N, strideY ), z, strideZ, stride2offset( N, strideZ ), fcn ); // eslint-disable-line max-len
 }
 
 

lib/node_modules/@stdlib/strided/base/smap2/manifest.json

@@ -32,7 +32,9 @@
 			],
 			"libraries": [],
 			"libpath": [],
-			"dependencies": []
+			"dependencies": [
+        "@stdlib/strided/base/stride2offset"
+      ]
 		}
 	]
 }

lib/node_modules/@stdlib/strided/base/smap2/src/main.c

@@ -17,6 +17,7 @@
 */
 
 #include "stdlib/strided/base/smap2.h"
+#include "stdlib/strided/base/stride2offset.h"
 #include <stdint.h>
 
 /**
@@ -55,21 +56,9 @@ void stdlib_strided_smap2( const int64_t N, const float *X, const int64_t stride
 	if ( N <= 0 ) {
 		return;
 	}
-	if ( strideX < 0 ) {
-		ix = (1-N) * strideX;
-	} else {
-		ix = 0;
-	}
-	if ( strideY < 0 ) {
-		iy = (1-N) * strideY;
-	} else {
-		iy = 0;
-	}
-	if ( strideZ < 0 ) {
-		iz = (1-N) * strideZ;
-	} else {
-		iz = 0;
-	}
+	ix = stdlib_strided_stride2offset( N, strideX );
+	iy = stdlib_strided_stride2offset( N, strideY );
+	iz = stdlib_strided_stride2offset( N, strideZ );
 	for ( i = 0; i < N; i++ ) {
 		Z[ iz ] = fcn( X[ ix ], Y[ iy ] );
 		ix += strideX;