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‎README.md

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**[⬆ Back to Top](#javascript-coding-challenges-for-beginners)**
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## 52. First Non-repeating Character
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Write a function that takes an input string and returns the first character that is not repeated anywhere in the string. Upper- and lowercase letters are considered the same character, but the function should return the correct case for the initial letter.
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```js
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const firstNonRepeatingLetter = str => {
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// Your solution
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};
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console.log(firstNonRepeatingLetter('a')); // 'a'
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console.log(firstNonRepeatingLetter('stress')); // 't'
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console.log(firstNonRepeatingLetter('sTreSS')); // 'T'
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console.log(firstNonRepeatingLetter('abba')); // ''
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console.log(firstNonRepeatingLetter("Go hang a salami, I'm a lasagna hog!")); // ','
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```
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<details><summary>Solution</summary>
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```js
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const firstNonRepeatingLetter = str => {
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const strToLower = str.toLowerCase();
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for (let char of str) {
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if (
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strToLower.indexOf(char.toLowerCase()) ===
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strToLower.lastIndexOf(char.toLowerCase())
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) {
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return char;
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}
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}
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return '';
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};
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```
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</details>
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---
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**[⬆ Back to Top](#javascript-coding-challenges-for-beginners)**

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