diff --git a/packages/pretty-format/src/index.js b/packages/pretty-format/src/index.js
index a7e5fdb1a02e..b2a25ffc9737 100644
--- a/packages/pretty-format/src/index.js
+++ b/packages/pretty-format/src/index.js
@@ -72,11 +72,8 @@ function printNumber(val: number): string {
 function printFunction(val: Function, printFunctionName: boolean): string {
   if (!printFunctionName) {
     return '[Function]';
-  } else if (val.name === '') {
-    return '[Function anonymous]';
-  } else {
-    return '[Function ' + val.name + ']';
   }
+  return '[Function ' + (val.name || 'anonymous') + ']';
 }
 
 function printSymbol(val: Symbol): string {
@@ -155,7 +152,7 @@ function printBasicValue(
   return null;
 }
 
-function printList(
+function printListItems(
   list: any,
   config: Config,
   indentation: string,
@@ -186,7 +183,7 @@ function printList(
   return result;
 }
 
-function printMap(
+function printMapEntries(
   val: Map<any, any>,
   config: Config,
   indentation: string,
@@ -203,7 +200,13 @@ function printMap(
     const indentationNext = indentation + config.indent;
 
     while (!current.done) {
-      const key = print(current.value[0], config, indentationNext, depth, refs);
+      const name = print(
+        current.value[0],
+        config,
+        indentationNext,
+        depth,
+        refs,
+      );
       const value = print(
         current.value[1],
         config,
@@ -212,7 +215,7 @@ function printMap(
         refs,
       );
 
-      result += indentationNext + key + ' => ' + value;
+      result += indentationNext + name + ' => ' + value;
 
       current = iterator.next();
 
@@ -229,7 +232,7 @@ function printMap(
   return result;
 }
 
-function printObject(
+function printObjectProperties(
   val: Object,
   config: Config,
   indentation: string,
@@ -269,7 +272,7 @@ function printObject(
   return result;
 }
 
-function printSet(
+function printSetValues(
   val: Set<any>,
   config: Config,
   indentation: string,
@@ -277,7 +280,7 @@ function printSet(
   refs: Refs,
 ): string {
   let result = '';
-  const iterator = val.entries();
+  const iterator = val.values();
   let current = iterator.next();
 
   if (!current.done) {
@@ -288,7 +291,7 @@ function printSet(
     while (!current.done) {
       result +=
         indentationNext +
-        print(current.value[1], config, indentationNext, depth, refs);
+        print(current.value, config, indentationNext, depth, refs);
 
       current = iterator.next();
 
@@ -312,12 +315,11 @@ function printComplexValue(
   depth: number,
   refs: Refs,
 ): string {
-  refs = refs.slice();
-  if (refs.indexOf(val) > -1) {
+  if (refs.indexOf(val) !== -1) {
     return '[Circular]';
-  } else {
-    refs.push(val);
   }
+  refs = refs.slice();
+  refs.push(val);
 
   const hitMaxDepth = ++depth > config.maxDepth;
   const min = config.min;
@@ -337,30 +339,33 @@ function printComplexValue(
       ? '[Arguments]'
       : (min ? '' : 'Arguments ') +
         '[' +
-        printList(val, config, indentation, depth, refs) +
+        printListItems(val, config, indentation, depth, refs) +
         ']';
-  } else if (isToStringedArrayType(toStringed)) {
+  }
+  if (isToStringedArrayType(toStringed)) {
     return hitMaxDepth
       ? '[' + val.constructor.name + ']'
       : (min ? '' : val.constructor.name + ' ') +
         '[' +
-        printList(val, config, indentation, depth, refs) +
+        printListItems(val, config, indentation, depth, refs) +
         ']';
-  } else if (toStringed === '[object Map]') {
+  }
+  if (toStringed === '[object Map]') {
     return hitMaxDepth
       ? '[Map]'
-      : 'Map {' + printMap(val, config, indentation, depth, refs) + '}';
-  } else if (toStringed === '[object Set]') {
+      : 'Map {' + printMapEntries(val, config, indentation, depth, refs) + '}';
+  }
+  if (toStringed === '[object Set]') {
     return hitMaxDepth
       ? '[Set]'
-      : 'Set {' + printSet(val, config, indentation, depth, refs) + '}';
+      : 'Set {' + printSetValues(val, config, indentation, depth, refs) + '}';
   }
 
   return hitMaxDepth
     ? '[' + (val.constructor ? val.constructor.name : 'Object') + ']'
     : (min ? '' : (val.constructor ? val.constructor.name : 'Object') + ' ') +
       '{' +
-      printObject(val, config, indentation, depth, refs) +
+      printObjectProperties(val, config, indentation, depth, refs) +
       '}';
 }