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‎README.md

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@@ -1663,3 +1663,58 @@ const solution = str => {
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**[⬆ Back to Top](#javascript-coding-challenges-for-beginners)**
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## 50. Check if Word Equals Summation of Two Words
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Let's assume that the numeric value of a letter is its position in the alphabet starting from `0` (i.e. `a -> 0, b -> 1, c -> 2`, etc.). Similarly, the numerical value of a string `str` consisting of some lowercase English letters is the concatenation (not sum!) of the numeric values of each letter in `str`, which is then converted into an integer. For example, if `str = 'acb'`, we concatenate each letter's numeric value, resulting in `021` which is then converted to integer `21`.
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You are given three strings `firstWord`, `secondWord`, and `targetWord`, each consisting of lowercase English letters `a` through `j` inclusive. Write a function that returns true if the sum of the numerical values of `firstWord` and `secondWord` equals the numerical value of `targetWord`.
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```js
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const isSumEqual = (firstWord, secondWord, targetWord) => {
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// Your solution
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};
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console.log(isSumEqual('acb', 'cba', 'cdb'));
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// The numerical value of firstWord 'acb' is '021' -> 21
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// The numerical value of secondWord 'cba' is '210' -> 210
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// The numerical value of targetWord 'cdb' is '231' -> 231
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// So we return true because 21 + 210 == 231
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console.log(isSumEqual('aaa', 'a', 'aab'));
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// The numerical value of firstWord 'aaa' is '000' -> 0
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// The numerical value of secondWord 'a' is '0' -> 0
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// The numerical value of targetWord 'aab' is '001' -> 1
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// So we return false because 0 + 0 != 1
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console.log(isSumEqual('aaa', 'a', 'aaaa'));
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// The numerical value of firstWord 'aaa' is '000' -> 0
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// The numerical value of secondWord 'a' is '0' -> 0
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// The numerical value of targetWord 'aaaa' is '0000' -> 0
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// So we return true because 0 + 0 == 0
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```
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<details><summary>Solution</summary>
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```js
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const getNumericValue = str => {
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const offset = 'a'.charCodeAt();
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const arr = [];
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for (let char of str) {
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arr.push(char.charCodeAt() - offset);
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}
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return parseInt(arr.join(''));
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}
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const isSumEqual = (firstWord, secondWord, targetWord) => {
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return getNumericValue(firstWord) + getNumericValue(secondWord) === getNumericValue(targetWord);
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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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