@@ -697,14 +697,16 @@ console.log(XO('ty')); // true (when no 'x' and 'o' is present should return tru
697697
698698``` js
699699const XO = str => {
700+ const lowerStr = str .toLowerCase ();
700701 let result = 0 ;
701- for (let letter of str . toLowerCase () ) {
702+ for (const letter of lowerStr ) {
702703 if (letter === ' x'
703704 result++ ;
704705 } else if (letter === ' o'
705706 result-- ;
706707 }
707708 }
709+ 708710 return ! result;
709711};
710712```
@@ -735,7 +737,7 @@ console.log(positiveSum([])); // 0
735737
736738``` js
737739const positiveSum = arr => {
738- return arr .filter ( ele => ele > 0 ). reduce (( a , b ) => a + b , 0 );
740+ return arr .reduce (( acc , cur ) => (cur > 0 ? acc + cur : acc) , 0 );
739741};
740742```
741743
@@ -766,9 +768,9 @@ console.log(findOutlier([4, 0, 100, 4, 11, 2602, 36])); // 11
766768
767769``` js
768770const findOutlier = arr => {
769- const even = arr .filter (ele => ele % 2 === 0 );
770- const odd = arr .filter (ele => ele % 2 !== 0 );
771- return even .length === 1 ? even [0 ] : odd [0 ];
771+ const evenArray = arr .filter (ele => ele % 2 === 0 );
772+ const oddArray = arr .filter (ele => ele % 2 !== 0 );
773+ return evenArray .length === 1 ? evenArray [0 ] : oddArray [0 ];
772774};
773775```
774776
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