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Update isIsogram.md

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nishanth2143
2020-10-11 11:49:50 +05:30
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@ -8,7 +8,7 @@ Creates a function that accepts a string parameter and output whether its an iso
- Use `String.toLowerCase()` to convert the string to lowercase letters. - Use `String.toLowerCase()` to convert the string to lowercase letters.
- Use `String.prototype.split()`, `String.prototype.indexOf()` and `Array.prototype.every()` to split the string into substrings, run a test for all the elements in that array and finally return the index of first occurence of a specified value in a string. - Use `String.prototype.split()`, `String.prototype.indexOf()` and `Array.prototype.every()` to split the string into substrings, run a test for all the elements in that array and finally return the index of first occurence of a specified value in a string.
- Function returns true if the string is an isogram (that is no letter is repeated) else returns false. - Function returns true if the string is an isogram (that is no letter is repeated) else returns false.
- Returns false is called with no parameter. - Returns false if called with no parameter.
```js ```js
const isIsogram = (str = null) => { const isIsogram = (str = null) => {