feat: refactor and add protocol support to stats/base/max-by

---
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---

Author: shwetasrsh

lib/node_modules/@stdlib/stats/base/max-by/lib/accessors.js

@@ -30,8 +30,9 @@ var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
 * Calculates the maximum value of a strided array via a callback function.
 *
 * @param {PositiveInteger} N - number of indexed elements
-* @param {Collection} x - input array/collection
-* @param {integer} stride - index increment
+* @param {Object} x - input array object
+* @param {Array<Function>} x.accessors - array element accessors
+* @param {integer} stride - stride length
 * @param {Callback} clbk - callback
 * @param {*} [thisArg] - execution context
 * @returns {number} maximum value
@@ -49,9 +50,8 @@ var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
 *
 */
 function maxBy( N, x, stride, clbk, thisArg ) {
-	var itemx;
 	var xbuf;
-	var item;
+	var tmp;
 	var get;
 	var max;
 	var ix;
@@ -81,8 +81,8 @@ function maxBy( N, x, stride, clbk, thisArg ) {
 		ix = 0;
 	}
 	for ( i = 0; i < N; i++) {
-		item = get( xbuf, ix );
-		max = clbk.call( thisArg, item, i, ix, x);
+		tmp = get( xbuf, ix );
+		max = clbk.call( thisArg, tmp, i, ix, x);
 		if ( max !== void 0 ) {
 			break;
 		}
@@ -94,8 +94,8 @@ function maxBy( N, x, stride, clbk, thisArg ) {
 	i += 1;
 	for ( i; i < N; i++) {
 		ix += stride;
-		itemx = get( xbuf, ix );
-		v = clbk.call( thisArg, itemx, i, ix, x );
+		tmp = get( xbuf, ix );
+		v = clbk.call( thisArg, tmp, i, ix, x );
 		if ( v === void 0 ) {
 			continue;
 		}