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JS: String Methods and Arrays

Chapter:6 String Methods: Display string length and first and last char
                  1. String length
                  2. String Index
                  3. Search for a string in a word
                  4. Substring
                  5. String replace
                  6. String case lowercase and uppercase
                  7. String trim
                  8. String cut
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Chapter:7 Array: Take CPU as array and display it properties
                    1. Create an array and array elements
                      2. Array Keyword
                    3. Pop
                    4. Push
                    5. Shifting
                    6. Sort

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