stdlib-js
diff --git a/‎.github/.keepalive
Lines changed: 0 additions & 1 deletion b/‎.github/.keepalive
Lines changed: 0 additions & 1 deletion
diff --git a/‎lib/factory.js
Lines changed: 4 additions & 3 deletions b/‎lib/factory.js
Lines changed: 4 additions & 3 deletions
@@ -21,6 +21,7 @@
 // MODULES //
 
 var isFunction = require( '@stdlib/assert-is-function' );
+var format = require( '@stdlib/string-format' );
 var PINF = require( '@stdlib/constants-float64-pinf' );
 var validate = require( './validate.js' );
 var limit = require( './limit.js' );
@@ -106,7 +107,7 @@ function factory( options, transform ) {
 		f = options;
 	}
 	if ( !isFunction( f ) ) {
-		throw new TypeError( 'invalid argument. Last argument must be a function. Value: `'+f+'`.' );
+		throw new TypeError( format( 'invalid argument. Last argument must be a function. Value: `%s`.', f ) );
 	}
 	if ( opts.series ) {
 		opts.limit = 1;
@@ -127,10 +128,10 @@ function factory( options, transform ) {
 	*/
 	function mapKeysAsync( obj, done ) {
 		if ( typeof obj !== 'object' || obj === null ) {
-			throw new TypeError( 'invalid argument. First argument must be an object. Value: `'+obj+'.`' );
+			throw new TypeError( format( 'invalid argument. First argument must be an object. Value: `%s`.', obj ) );
 		}
 		if ( !isFunction( done ) ) {
-			throw new TypeError( 'invalid argument. Last argument must be a function. Value: `'+done+'`.' );
+			throw new TypeError( format( 'invalid argument. Last argument must be a function. Value: `%s`.', done ) );
 		}
 		return limit( obj, opts, f, clbk );