31     nativeKeys         = Object.keys,
104             keys = keysFunc(source),
105             l = keys.length;
107           var key = keys[i];
156       var keys = _.keys(obj);
157       for (i = 0, length = keys.length; i < length; i++) {
158         iteratee(obj[keys[i]], keys[i], obj);
167     var keys = !isArrayLike(obj) && _.keys(obj),  variable
168         length = (keys || obj).length,
171       var currentKey = keys ? keys[index] : index;
181     function iterator(obj, iteratee, memo, keys, index, length) {  argument
183         var currentKey = keys ? keys[index] : index;
191       var keys = !isArrayLike(obj) && _.keys(obj),
192           length = (keys || obj).length,
196         memo = obj[keys ? keys[index] : index];
199       return iterator(obj, iteratee, memo, keys, index, length);
241     var keys = !isArrayLike(obj) && _.keys(obj),  variable
242         length = (keys || obj).length;
244       var currentKey = keys ? keys[index] : index;
254     var keys = !isArrayLike(obj) && _.keys(obj),  variable
255         length = (keys || obj).length;
257       var currentKey = keys ? keys[index] : index;
436     return isArrayLike(obj) ? obj.length : _.keys(obj).length;
909   function collectNonEnumProps(obj, keys) {  argument
916     if (_.has(obj, prop) && !_.contains(keys, prop)) keys.push(prop);
920       if (prop in obj && obj[prop] !== proto[prop] && !_.contains(keys, prop)) {
921         keys.push(prop);
928   _.keys = function(obj) {  function
931     var keys = [];
932     for (var key in obj) if (_.has(obj, key)) keys.push(key);
934     if (hasEnumBug) collectNonEnumProps(obj, keys);
935     return keys;
941     var keys = [];
942     for (var key in obj) keys.push(key);
944     if (hasEnumBug) collectNonEnumProps(obj, keys);
945     return keys;
950     var keys = _.keys(obj);
951     var length = keys.length;
954       values[i] = obj[keys[i]];
963     var keys =  _.keys(obj),
964           length = keys.length,
968         currentKey = keys[index];
976     var keys = _.keys(obj);
977     var length = keys.length;
980       pairs[i] = [keys[i], obj[keys[i]]];
988     var keys = _.keys(obj);
989     for (var i = 0, length = keys.length; i < length; i++) {
990       result[obj[keys[i]]] = keys[i];
1010   _.extendOwn = _.assign = createAssigner(_.keys);
1015     var keys = _.keys(obj), key;
1016     for (var i = 0, length = keys.length; i < length; i++) {
1017       key = keys[i];
1024     var result = {}, obj = object, iteratee, keys;
1027       keys = _.allKeys(obj);
1030       keys = flatten(arguments, false, false, 1);
1034     for (var i = 0, length = keys.length; i < length; i++) {
1035       var key = keys[i];
1047       var keys = _.map(flatten(arguments, false, false, 1), String);
1049         return !_.contains(keys, key);
1083     var keys = _.keys(attrs), length = keys.length;
1087       var key = keys[i];
1171       var keys = _.keys(a), key;
1172       length = keys.length;
1174       if (_.keys(b).length !== length) return false;
1177         key = keys[length];
1197     return _.keys(obj).length === 0;
1352     var source = '(?:' + _.keys(map).join('|') + ')';