101 lines
2.6 KiB
Markdown
101 lines
2.6 KiB
Markdown
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---
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id: a0b5010f579e69b815e7c5d6
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title: Search and Replace
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challengeType: 5
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forumTopicId: 16045
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dashedName: search-and-replace
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---
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# --description--
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Perform a search and replace on the sentence using the arguments provided and return the new sentence.
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First argument is the sentence to perform the search and replace on.
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Second argument is the word that you will be replacing (before).
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Third argument is what you will be replacing the second argument with (after).
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**Note:** Preserve the case of the first character in the original word when you are replacing it. For example if you mean to replace the word `Book` with the word `dog`, it should be replaced as `Dog`
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# --hints--
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`myReplace("Let us go to the store", "store", "mall")` should return the string `Let us go to the mall`.
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```js
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assert.deepEqual(
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myReplace('Let us go to the store', 'store', 'mall'),
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'Let us go to the mall'
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);
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```
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`myReplace("He is Sleeping on the couch", "Sleeping", "sitting")` should return the string `He is Sitting on the couch`.
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```js
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assert.deepEqual(
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myReplace('He is Sleeping on the couch', 'Sleeping', 'sitting'),
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'He is Sitting on the couch'
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);
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```
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`myReplace("I think we should look up there", "up", "Down")` should return the string `I think we should look down there`.
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```js
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assert.deepEqual(
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myReplace('I think we should look up there', 'up', 'Down'),
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'I think we should look down there'
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);
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```
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`myReplace("This has a spellngi error", "spellngi", "spelling")` should return the string `This has a spelling error`.
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```js
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assert.deepEqual(
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myReplace('This has a spellngi error', 'spellngi', 'spelling'),
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'This has a spelling error'
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);
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```
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`myReplace("His name is Tom", "Tom", "john")` should return the string `His name is John`.
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```js
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assert.deepEqual(
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myReplace('His name is Tom', 'Tom', 'john'),
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'His name is John'
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);
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```
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`myReplace("Let us get back to more Coding", "Coding", "algorithms")` should return the string `Let us get back to more Algorithms`.
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```js
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assert.deepEqual(
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myReplace('Let us get back to more Coding', 'Coding', 'algorithms'),
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'Let us get back to more Algorithms'
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);
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```
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# --seed--
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## --seed-contents--
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```js
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function myReplace(str, before, after) {
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return str;
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}
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myReplace("A quick brown fox jumped over the lazy dog", "jumped", "leaped");
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```
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# --solutions--
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```js
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function myReplace(str, before, after) {
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if (before.charAt(0) === before.charAt(0).toUpperCase()) {
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after = after.charAt(0).toUpperCase() + after.substring(1);
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} else {
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after = after.charAt(0).toLowerCase() + after.substring(1);
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}
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return str.replace(before, after);
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}
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```
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