javascript - First sums, second doesn't -> why? -

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  & lt;! - पहले - & gt; & LT; स्क्रिप्ट & gt; Var कुल = 0; Var newAccumulator = function () {रिटर्न फ़ंक्शन (i) {total + = i; }; } Var foldl = function (arr, putNum) {for (var i = 0; i & lt; arr.length; ++ i) {putNum (arr [i]); }} गुनाह ([1, 2, 3, 4], नया आकस्मिक ()); Document.write ("योग:" + कुल + "& lt; br / & gt;"); & Lt; / स्क्रिप्ट & gt; & Lt;! - सेकंड - & gt; & LT; स्क्रिप्ट & gt; Var कुल = 0; Var newAccumulator = फ़ंक्शन (i) {कुल + = i; } Var foldl = function (arr, putNum) {for (var i = 0; i & lt; arr.length; ++ i) {putNum (arr [i]); }} गुनाह ([1, 2, 3, 4], नया आकस्मिक ()); Document.write ("योग:" + कुल + "& lt; br / & gt;"); & Lt; / स्क्रिप्ट & gt;    
 
 
 कॉल में  foldl  आप  नया एक्सेमुलेटर  फ़ंक्शन: 
 
  गुनाह ([1, 2, 3, 4], नयाएकुम्युलेटर ());  
 
 पहले मामले में यह एक समारोह देता है जो संक्षेप करता है: 
 
  रिटर्न फ़ंक्शन (i) {total + = i; };  
 
 दूसरे मामले में  newAccumulator  को कॉल कुछ भी वापस नहीं करता है, इसलिए  foldl  में कोई फ़ंक्शन नहीं है जिसे कॉल कर सकता है राशि की गणना करने के लिए। 
 आपको नये कोडमांड को सीधे  foldl  से गुजरना चाहिए, यह मूल्य नहीं है (वापस नहीं): 
 
  foldl ([1, 2] , 3, 4], नया एजूमुलेटर);

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