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fix(guide): update "Search and Replace" intermediate solution (#36366)

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new solution addresses the possibility of first letter of arg "before" being lower case and needing to change the first letter of "after" from capital to lowercase

solution more streamlined

added resource to help with regular expressions
This commit is contained in:
Jesse Rykerson
2019-07-24 10:31:35 -04:00
committed by mrugesh
parent dd3c0e0893
commit 284db50f47
1 changed files with 10 additions and 13 deletions
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23
guide/english/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/search-and-replace/index.md
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@@ -76,17 +76,15 @@ myReplace("A quick brown fox jumped over the lazy dog", "jumped", "leaped");
```javascript
function myReplace(str, before, after) {
//Create a regular expression object
var re = new RegExp(before, "gi");
//Check whether the first letter is uppercase or not
if (/[A-Z]/.test(before[0])) {
//Change the word to be capitalized
after = after.charAt(0).toUpperCase() + after.slice(1);
// Check if first character of argument "before" is a capital or lowercase letter and change the first character of argument "after" to match the case
if (/^[A-Z]/.test(before)) {
after = after[0].toUpperCase() + after.substr(1)
} else {
after = after[0].toLowerCase() + after.substr(1)
}
//Replace the original word with new one
var newStr = str.replace(re, after);
return newStr;
// return string with argument "before" replaced by argument "after" (with correct case)
return str.replace(before, after);
}
// test here
@@ -95,11 +93,10 @@ myReplace("A quick brown fox jumped over the lazy dog", "jumped", "leaped");
#### Code Explanation
* In this solution, regular expression `[A-Z]` is used to check if character is uppercase.
* Create a new regular expression object, **re**.
* In this solution, regular expression `^[A-Z]` is used to check (test) if the first character of **before** is uppercase.
* If first letter of **before** is capitalized, change the first letter of **after** to uppercase.
* Replace **before** with **after** in the string.
* Return the new string.
* Else: If first letter of **before** is lowercase, change the first letter of **after** to lowercase
* Return the new string replacing **before** with **after**.
#### Relevant Links