refactor: ensure support for enumeration constants

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: passed
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/bytes-per-element/lib/main.js

@@ -21,7 +21,9 @@
 // MODULES //
 
 var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
+var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
 var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
+var enum2str = require( '@stdlib/ndarray/base/dtype-enum2str' );
 var BYTES_PER_ELEMENT = require( './bytes_per_element.json' );
 
 
@@ -60,6 +62,9 @@ function bytesPerElement( dtype ) {
 	if ( isString( dtype ) ) {
 		return BYTES_PER_ELEMENT[ dtype ] || null;
 	}
+	if ( isNumber( dtype ) ) {
+		return BYTES_PER_ELEMENT[ enum2str( dtype ) ] || null;
+	}
 	if ( dtype ) {
 		v = dtype.byteLength;
 		if ( isPositiveInteger( v ) ) {

lib/node_modules/@stdlib/ndarray/base/bytes-per-element/test/test.js

@@ -23,6 +23,7 @@
 var tape = require( 'tape' );
 var DataType = require( '@stdlib/ndarray/dtype-ctor' );
 var structFactory = require( '@stdlib/dstructs/struct' );
+var resolveEnum = require( '@stdlib/ndarray/base/dtype-resolve-enum' );
 var bytesPerElement = require( './../lib' );
 
 
@@ -84,6 +85,56 @@ tape( 'the function returns the number of bytes per element provided an underlyi
 	t.end();
 });
 
+tape( 'the function returns the number of bytes per element provided an underlying array data type (enum)', function test( t ) {
+	var expected;
+	var values;
+	var nbytes;
+	var i;
+
+	values = [
+		resolveEnum( 'float64' ),
+		resolveEnum( 'float32' ),
+		resolveEnum( 'float16' ),
+		resolveEnum( 'int8' ),
+		resolveEnum( 'uint8' ),
+		resolveEnum( 'uint8c' ),
+		resolveEnum( 'int16' ),
+		resolveEnum( 'uint16' ),
+		resolveEnum( 'int32' ),
+		resolveEnum( 'uint32' ),
+		resolveEnum( 'int64' ),
+		resolveEnum( 'uint64' ),
+		resolveEnum( 'binary' ),
+		resolveEnum( 'complex64' ),
+		resolveEnum( 'complex128' ),
+		resolveEnum( 'generic' )
+	];
+
+	expected = [
+		8,
+		4,
+		2,
+		1,
+		1,
+		1,
+		2,
+		2,
+		4,
+		4,
+		8,
+		8,
+		1,
+		8,
+		16,
+		null
+	];
+	for ( i = 0; i < values.length; i++ ) {
+		nbytes = bytesPerElement( values[ i ] );
+		t.strictEqual( nbytes, expected[ i ], 'returns '+expected[i]+' when provided '+values[i] );
+	}
+	t.end();
+});
+
 tape( 'the function returns the number of bytes per element provided an underlying array data type (data type, string)', function test( t ) {
 	var expected;
 	var values;
@@ -207,7 +258,13 @@ tape( 'the function returns the number of bytes per element provided an underlyi
 });
 
 tape( 'the function returns `null` if provided an unknown/unsupported data type', function test( t ) {
-	var nbytes = bytesPerElement( 'foobar' );
+	var nbytes;
+
+	nbytes = bytesPerElement( 'foobar' );
+	t.strictEqual( nbytes, null, 'returns expected value' );
+
+	nbytes = bytesPerElement( 3.145929442432 );
 	t.strictEqual( nbytes, null, 'returns expected value' );
+
 	t.end();
 });