Convert remaining vars to let/const.

_baseExtremum.js

@@ -11,10 +11,12 @@ import isSymbol from './isSymbol.js';
  * @returns {*} Returns the extremum value.
  */
 function baseExtremum(array, iteratee, comparator) {
+  let result;
   let index = -1;
   const length = array.length;
 
   while (++index < length) {
+    let computed;
     const value = array[index];
     const current = iteratee(value);
 
@@ -22,8 +24,8 @@ function baseExtremum(array, iteratee, comparator) {
           ? (current === current && !isSymbol(current))
           : comparator(current, computed)
         )) {
-      var computed = current,
+      computed = current;
-          result = value;
+      result = value;
     }
   }
   return result;

_baseIntersection.js

@@ -25,11 +25,12 @@ function baseIntersection(arrays, iteratee, comparator) {
   const caches = Array(othLength);
   const result = [];
 
+  let array;
   let maxLength = Infinity;
   let othIndex = othLength;
 
   while (othIndex--) {
-    var array = arrays[othIndex];
+    array = arrays[othIndex];
     if (othIndex && iteratee) {
       array = arrayMap(array, baseUnary(iteratee));
     }

_basePullAt.js

@@ -21,9 +21,10 @@ function basePullAt(array, indexes) {
   const lastIndex = length - 1;
 
   while (length--) {
+    let previous;
     const index = indexes[length];
     if (length == lastIndex || index !== previous) {
-      var previous = index;
+      previous = index;
       if (isIndex(index)) {
         splice.call(array, index, 1);
       } else {

_baseSortedIndexBy.js

@@ -31,6 +31,7 @@ function baseSortedIndexBy(array, value, iteratee, retHighest) {
   const valIsUndefined = value === undefined;
 
   while (low < high) {
+    let setLow;
     const mid = nativeFloor((low + high) / 2);
     const computed = iteratee(array[mid]);
     const othIsDefined = computed !== undefined;
@@ -39,7 +40,7 @@ function baseSortedIndexBy(array, value, iteratee, retHighest) {
     const othIsSymbol = isSymbol(computed);
 
     if (valIsNaN) {
-      var setLow = retHighest || othIsReflexive;
+      setLow = retHighest || othIsReflexive;
     } else if (valIsUndefined) {
       setLow = othIsReflexive && (retHighest || othIsDefined);
     } else if (valIsNull) {

_createFind.js

@@ -11,9 +11,10 @@ import keys from './keys.js';
  */
 function createFind(findIndexFunc) {
   return (collection, predicate, fromIndex) => {
+    let iteratee;
     const iterable = Object(collection);
     if (!isArrayLike(collection)) {
-      var iteratee = baseIteratee(predicate, 3);
+      iteratee = baseIteratee(predicate, 3);
       collection = keys(collection);
       predicate = key => iteratee(iterable[key], key, iterable);
     }

_createFlow.js

@@ -25,18 +25,21 @@ function createFlow(fromRight) {
   return flatRest(funcs => {
     const length = funcs.length;
     const prereq = LodashWrapper.prototype.thru;
+
+    let func;
+    let wrapper;
     let index = length;
 
     if (fromRight) {
       funcs.reverse();
     }
     while (index--) {
-      var func = funcs[index];
+      func = funcs[index];
       if (typeof func != 'function') {
         throw new TypeError(FUNC_ERROR_TEXT);
       }
       if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
-        var wrapper = new LodashWrapper([], true);
+        wrapper = new LodashWrapper([], true);
       }
     }
     index = wrapper ? index : length;

_createWrap.js

@@ -62,10 +62,11 @@ function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arit
   arity = arity === undefined ? arity : toInteger(arity);
   length -= holders ? holders.length : 0;
 
+  let holdersRight;
+  let partialsRight;
   if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
-    var partialsRight = partials,
+    partialsRight = partials,
-        holdersRight = holders;
+    holdersRight = holders;
-
     partials = holders = undefined;
   }
   const data = isBindKey ? undefined : getData(func);
@@ -90,8 +91,9 @@ function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arit
   if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
     bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
   }
+  let result;
   if (!bitmask || bitmask == WRAP_BIND_FLAG) {
-    var result = createBind(func, bitmask, thisArg);
+    result = createBind(func, bitmask, thisArg);
   } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
     result = createCurry(func, bitmask, arity);
   } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {

_equalArrays.js

@@ -41,10 +41,12 @@ function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
 
   // Ignore non-index properties.
   while (++index < arrLength) {
-    const arrValue = array[index], othValue = other[index];
+    let compared;
+    const arrValue = array[index];
+    const othValue = other[index];
 
     if (customizer) {
-      var compared = isPartial
+      compared = isPartial
         ? customizer(othValue, arrValue, index, other, array, stack)
         : customizer(arrValue, othValue, index, array, other, stack);
     }

_getRawTag.js

@@ -26,10 +26,11 @@ const symToStringTag = Symbol ? Symbol.toStringTag : undefined;
 function getRawTag(value) {
   const isOwn = hasOwnProperty.call(value, symToStringTag);
   const tag = value[symToStringTag];
+  let unmasked = false;
 
   try {
     value[symToStringTag] = undefined;
-    var unmasked = true;
+    unmasked = true;
   } catch (e) {}
 
   const result = nativeObjectToString.call(value);

_hasPath.js

@@ -17,12 +17,13 @@ import toKey from './_toKey.js';
 function hasPath(object, path, hasFunc) {
   path = castPath(path, object);
 
-  let index = -1,
+  let key;
-      length = path.length,
+  let index = -1;
-      result = false;
+  let length = path.length;
+  let result = false;
 
   while (++index < length) {
-    var key = toKey(path[index]);
+    key = toKey(path[index]);
     if (!(result = object != null && hasFunc(object, key))) {
       break;
     }

_memoizeCapped.js

@@ -19,7 +19,7 @@ function memoizeCapped(func) {
     return key;
   });
 
-  var cache = result.cache;
+  const cache = result.cache;
   return result;
 }
 

_mergeData.js

@@ -55,9 +55,10 @@ function mergeData(data, source) {
     newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
   }
   // Compose partial arguments.
+  let partials;
   let value = source[3];
   if (value) {
-    var partials = data[3];
+    partials = data[3];
     data[3] = partials ? composeArgs(partials, value, source[4]) : value;
     data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
   }