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so hereamp;#39;s a cool trick in JavaScript say you need all the letters of the alphabet stored in an array to check the validity of a string and you donamp;#39;t have to type it out by hand or you can use ASCII to do this hereamp;#39;s how so letamp;#39;s declare an array if we Loop through where I is equal to 97 I is less than or equal to one two two so this for loop iterates from 97 and 97 is the Unicode for the character of a whereas 1 to 2 as you guessed it the Unicode character for the letter Z and we could use a method called from Char code so if we say string with a capital S and use from charcode method and we pass in the index this is going to convert Char code to a string if we push this into the array and console log array we get the letters from A to Z printed within an array