@@ -118,6 +118,44 @@ console.log("Binary Search: ", binarySearch(arr5, target2));
118118console . log ( "-------------------------------------------------" ) ;
119119console . log ( "Activity 3: " ) ;
120120
121+ // Write a function to count the occurrences of each character in a string. Log the character counts.
122+ 123+ const countCharacters = ( str ) => {
124+ let charCount = { } ;
125+ for ( let char of str ) {
126+ if ( charCount [ char ] ) {
127+ charCount [ char ] ++ ;
128+ } else {
129+ charCount [ char ] = 1 ;
130+ }
131+ }
132+ return charCount ;
133+ }
134+ 135+ let str = "hello" ;
136+ console . log ( "Character Count: " , countCharacters ( str ) ) ;
137+ 138+ // Task 7: Write a function to find the longest substring without repeating characters in a string. Log the length of the substring.
139+ 140+ const longestSubstring = ( str ) => {
141+ let longest = 0 ;
142+ let start = 0 ;
143+ let charIndex = { } ;
144+ 145+ for ( let i = 0 ; i < str . length ; i ++ ) {
146+ let char = str [ i ] ;
147+ if ( charIndex [ char ] >= start ) {
148+ start = charIndex [ char ] + 1 ;
149+ }
150+ charIndex [ char ] = i ;
151+ longest = Math . max ( longest , i - start + 1 ) ;
152+ }
153+ return longest ;
154+ }
155+ 156+ let str2 = "abcabcbb" ;
157+ console . log ( "Longest Substring: " , longestSubstring ( str2 ) ) ;
158+ 121159console . log ( "-------------------------------------------------" ) ;
122160console . log ( "Activity 4: " ) ;
123161
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