2021-06-15 07:49:18 +00:00
---
id: a0b5010f579e69b815e7c5d6
2021-07-16 05:33:16 +00:00
title: Procurar e substituir
2021-06-15 07:49:18 +00:00
challengeType: 5
forumTopicId: 16045
dashedName: search-and-replace
---
# --description--
2021-07-16 05:33:16 +00:00
Realize uma busca e substitua na frase usando os argumentos fornecidos e retorne a nova frase.
2021-06-15 07:49:18 +00:00
2021-07-16 05:33:16 +00:00
O primeiro argumento é a frase para realizar a busca e substituir.
2021-06-15 07:49:18 +00:00
2021-07-16 05:33:16 +00:00
O segundo argumento é a palavra que você substituirá (antes).
2021-06-15 07:49:18 +00:00
2021-07-28 17:37:39 +00:00
O terceiro argumento é com o que você vai substituir o segundo argumento (depois).
2021-06-15 07:49:18 +00:00
2021-07-28 17:37:39 +00:00
**Observação:** preserve a capitalização do primeiro caractere na palavra original quando você estiver substituindo. Por exemplo, se você quiser substituir a palavra `Book` com a palavra `dog` , deve ser substituído com `Dog`
2021-06-15 07:49:18 +00:00
# --hints--
2021-07-16 05:33:16 +00:00
`myReplace("Let us go to the store", "store", "mall")` deve retornar a string `Let us go to the mall` .
2021-06-15 07:49:18 +00:00
```js
assert.deepEqual(
myReplace('Let us go to the store', 'store', 'mall'),
'Let us go to the mall'
);
```
2021-07-16 05:33:16 +00:00
`myReplace("He is Sleeping on the couch", "Sleeping", "sitting")` deve retornar a string `He is Sitting on the couch` .
2021-06-15 07:49:18 +00:00
```js
assert.deepEqual(
myReplace('He is Sleeping on the couch', 'Sleeping', 'sitting'),
'He is Sitting on the couch'
);
```
2021-07-16 05:33:16 +00:00
`myReplace("I think we should look up there", "up", "Down")` deve retornar a string `I think we should look down there` .
2021-06-15 07:49:18 +00:00
```js
assert.deepEqual(
myReplace('I think we should look up there', 'up', 'Down'),
'I think we should look down there'
);
```
2021-07-16 05:33:16 +00:00
`myReplace("This has a spellngi error", "spellngi", "spelling")` deve retornar a string `This has a spelling error` .
2021-06-15 07:49:18 +00:00
```js
assert.deepEqual(
myReplace('This has a spellngi error', 'spellngi', 'spelling'),
'This has a spelling error'
);
```
2021-07-16 05:33:16 +00:00
`myReplace("His name is Tom", "Tom", "john")` deve retornar a string `His name is John` .
2021-06-15 07:49:18 +00:00
```js
assert.deepEqual(
myReplace('His name is Tom', 'Tom', 'john'),
'His name is John'
);
```
2021-07-16 05:33:16 +00:00
`myReplace("Let us get back to more Coding", "Coding", "algorithms")` deve retornar a string `Let us get back to more Algorithms` .
2021-06-15 07:49:18 +00:00
```js
assert.deepEqual(
myReplace('Let us get back to more Coding', 'Coding', 'algorithms'),
'Let us get back to more Algorithms'
);
```
# --seed--
## --seed-contents--
```js
function myReplace(str, before, after) {
return str;
}
myReplace("A quick brown fox jumped over the lazy dog", "jumped", "leaped");
```
# --solutions--
```js
function myReplace(str, before, after) {
if (before.charAt(0) === before.charAt(0).toUpperCase()) {
after = after.charAt(0).toUpperCase() + after.substring(1);
} else {
after = after.charAt(0).toLowerCase() + after.substring(1);
}
return str.replace(before, after);
}
```