Hacktoberfest

Javascript/program-11/program.js

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+const isIsogram = str => {
+    str = str.toLowerCase();
+    for (let i=0 ; str.length > i ; i++){
+        for(let j=1+i ; str.length > j ; j++ ){
+            if ( str[i]==str[j] ){
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+//isIsogram('isogram'); // true
+//isIsogram('isIsogram'); // false

Javascript/program-11/readme.md

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+---
+title: isIsogram
+tags: string,begginer
+---
+
+Checks if a given word is an isogram or not. An isogram is a word that has no repeating letters.
+
+- Convert string to `lowercase`/`uppercase` since capital letters do not equate to small letter.
+- Iterate the string using 2 for loops using the iterators `i` and `j`. Where `j` starts of 1 more than `i`. 
+- If at any point `str[i]` is equal to `str[j]` return `false`.
+- If the above does not happen till you reach the end of the string return `true`.