diff --git a/snippets/isLowerCase.md b/snippets/isLowerCase.md
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+### isLowerCase
+
+Checks if the provided argument contains anything else than the lowerCase alphabets. If the second argument is provided to be true than numbers and other symbols are considered lowercase too.
+
+``` js
+const isLowerCase = (val,symbol = false) => {
+  if (symbol) return val === val.toLowerCase()
+  else return !(/[^a-z]/g.test(val))
+}
+```
+```js
+isUpperCase('abc'); //true
+isUpperCase('abc123@$'); //false
+isUpperCase('abc123@$',true); //true
+isUpperCase('abc123@$ABCD',true); //false
+isUpperCase('abc123@$ABCD'); //false
+```
diff --git a/snippets/isUpperCase.md b/snippets/isUpperCase.md
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+### isUpperCase
+
+Checks if the provided argument contains anything else than the upperCase alphabets. If the second argument is provided to be true than numbers and other symbols are considered uppercase too.
+``` js
+const isUpperCase = (val,symbol = false) => {
+  if (symbol) return val === val.toUpperCase()
+  else return!(/[^A-Z]/g.test(val))
+}
+```
+``` js
+isUpperCase('ABC'); //true
+isUpperCase('ABC123@$'); //false
+isUpperCase('ABC123@$',true); //true
+isUpperCase('ABC123@$abcd',true); //false
+isUpperCase('ABC123@$abcd'); //false
+```