bench: refactor to use string interpolation in assert/is-almost-equal-complex64array

PR-URL: #9874
Ref: #8647
Reviewed-by: Athan Reines <kgryte@gmail.com>

Author: sagar7162

lib/node_modules/@stdlib/assert/is-almost-equal-complex64array/benchmark/benchmark.length.js

@@ -25,6 +25,7 @@ var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
 var pow = require( '@stdlib/math/base/special/pow' );
 var zeroTo = require( '@stdlib/array/base/zero-to' );
 var Complex64Array = require( '@stdlib/array/complex64' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var isAlmostEqualComplex64Array = require( './../lib' );
 
@@ -90,7 +91,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+':len='+len, f );
+		bench( format( '%s:len=%d', pkg, len ), f );
 	}
 }