Auto-generated commit

Author: stdlib-bot

README.md

@@ -61,7 +61,7 @@ var out = truncateMiddle( 'beep boop', 7 );
 // returns 'be...op'
 ```
 
-By default, the truncated string uses the replacement sequence `'...'` in the middle. To customize the replacement sequence, provide a `seq` argument:
+By default, the truncated string uses the replacement sequence `'...'`. To customize the replacement sequence, provide a `seq` argument:
 
 ```javascript
 var out = truncateMiddle( 'beep boop', 7, '!' );
@@ -99,7 +99,7 @@ var out = truncateMiddle( str, 15 );
 // returns 'Lorem ... elit.'
 
 str = 'To be or not to be, that is the question';
-out = truncateMiddle( str, 19, '!' );
+out = truncateMiddle( str, 19, '|' );
 // returns 'To be or | question'
 
 str = 'The quick fox jumps over the lazy dog.';

lib/main.js

@@ -78,8 +78,8 @@ function truncateMiddle( str, len, seq ) {
 	var seqStart;
 	var nVisual;
 	var seqEnd;
-	var idx;
-	var out;
+	var idx2;
+	var idx1;
 	if ( !isString( str ) ) {
 		throw new TypeError( 'invalid argument. First argument must be a string primitive. Value: `' + str + '`.' );
 	}
@@ -95,7 +95,6 @@ function truncateMiddle( str, len, seq ) {
 	seqLength = numGraphemeClusters( seq );
 	strLength = numGraphemeClusters( str );
 	fromIndex = 0;
-	out = '';
 	if ( len > strLength ) {
 		return str;
 	}
@@ -106,24 +105,20 @@ function truncateMiddle( str, len, seq ) {
 	seqEnd = strLength - floor( ( len - seqLength ) / 2 );
 	nVisual = 0;
 	while ( nVisual < seqStart ) {
-		idx = nextGraphemeClusterBreak( str, fromIndex );
-		out += str.slice( fromIndex, idx );
-		fromIndex = idx;
+		idx1 = nextGraphemeClusterBreak( str, fromIndex );
+		fromIndex = idx1;
 		nVisual += 1;
 	}
-	out += seq;
-	while ( idx > 0 ) {
-		idx = nextGraphemeClusterBreak( str, fromIndex );
-		if ( idx === -1 ) {
-			out += str.slice( fromIndex );
+	idx2 = idx1;
+	while ( idx2 > 0 ) {
+		idx2 = nextGraphemeClusterBreak( str, fromIndex );
+		if ( idx2 >= seqEnd + fromIndex - nVisual ) {
+			break;
 		}
-		else if ( idx > seqEnd + fromIndex - nVisual ) {
-			out += str.slice( fromIndex, idx );
-		}
-		fromIndex = idx;
+		fromIndex = idx2;
 		nVisual += 1;
 	}
-	return out;
+	return str.substring( 0, idx1 ) + seq + str.substring( idx2 );
 }