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08-numbers-and-strings/02-strings/questions/questions.md
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08-numbers-and-strings/02-strings/questions/questions.md
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## What's the result of this expression?
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```go
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"\"Hello\\"" + ` \"World\"`
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```
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1. "Hello" "World"
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2. "Hello" \"World\" *CORRECT*
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3. "Hello" `"World"`
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4. "\"Hello\" `\"World\"`"
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> 1. Go doesn't interpret the escape sequences in raw string literals.
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> 2. That's right. Go interprets `\"` as `"` but it doesn't do so for ` \"World\"`.
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## What's the best way to represent the following text in the code?
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```xml
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<xml>
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<items>
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<item>"Teddy Bear"</item>
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</items>
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</xml>
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```
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1. *CORRECT*
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```go
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`<xml>
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<items>
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<item>"Teddy Bear"</item>
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</items>
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</xml>`
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```
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2.
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```go
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"<xml>
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<items>
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<item>"Teddy Bear"</item>
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</items>
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</xml>"
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```
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3.
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```go
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"<xml>
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<items>
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<item>\"Teddy Bear\"</item>
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</items>
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</xml>"
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```
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4.
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```go
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`<xml>
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<items>
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<item>\"Teddy Bear\"</item>
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</items>
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</xml>`
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```
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> 2-3. You can't write a string literal like that. It can't be multiple-lines.
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> 4. You don't need to use escape sequences inside raw string literals.
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## What's the result of the following expression?
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```go
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len("lovely")
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```
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1. 7
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2. 8
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3. 6 *CORRECT*
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4. 0
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> 2. Remember! "a" is 1 char. `a` is also 1 char.
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## What's the result of the following expression?
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```go
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len("very") + len(`\"cool\"`)
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```
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1. 8
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2. 12 *CORRECT*
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3. 16
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4. 10
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> 1. There are also double-quotes, count them as well.
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> 2. That's right. Go doesn't interpreted \" in raw string literals.
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> 3. Remember! "very" is 4 characters. `very` is also 4 characters.
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> 4. Remember! Go doesn't interpreted \" in raw string literals.
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## What's the result of the following expression?
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```go
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len("very") + len("\"cool\"")
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```
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1. 8
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2. 12
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3. 16
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4. 10 *CORRECT*
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> 1. There are also double-quotes, count them as well.
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> 2. Remember! Go interprets escape sequences in string literals.
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> 4. That's right. Go does interpret \" in a string literal. So, "\"" means ", which is 1 character.
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## What's the result of the following expression?
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```go
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len("péripatéticien")
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```
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**HINT:** é is 2 bytes long. And, the len function counts the bytes not the letters.
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**USELESS INFORMATION:** "péripatéticien" means "wanderer".
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1. 14
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2. 16 *CORRECT*
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3. 18
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4. 20
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> 1. Remember! é is 2 bytes long.
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> 2. An english letter is 1 byte long. However, é is 2 bytes long. So, that makes up 16 bytes. Cool.
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> 3. You didn't count the double-quotes, did you?
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## How can you find the correct length of the characters in this string literal?
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```go
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"péripatéticien"
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```
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1. `len(péripatéticien)`
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2. `len("péripatéticien")`
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3. `utf8.RuneCountInString("péripatéticien")` *CORRECT*
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4. `unicode/utf8.RuneCountInString("péripatéticien")`
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> 1. Where are the double-quotes?
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> 2. This only finds the bytes in a string value.
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> 4. You're close. But, the package's name is utf8 not unicode/utf8.
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## What's the result of the following expression?
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```go
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utf8.RuneCountInString("péripatéticien")
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```
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1. 16
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2. 14 *CORRECT*
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3. 18
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4. 20
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> 1. This is its byte count. `RuneCountInString` counts the runes (codepoints) not the bytes.
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> 2. That's right. `RuneCountInString` returns the number of runes (codepoints) in a string value.
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## Which package contains string manipulation functions?
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1. string
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2. unicode/utf8
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3. strings *CORRECT*
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4. unicode/strings
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## What's the result of this expression?
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```go
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strings.Repeat("*x", 3) + "*"
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```
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**HINT:** Repeat function repeats the given string.
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1. `*x*x*x`
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2. `x*x*x`
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3. `*x3`
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4. `*x*x*x*` *CORRECT*
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> 1. You're close but you missed the concatenation at the end.
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> 2. Look closely.
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> 3. Wow! You should really watch the lectures again. Sorry.
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> 4. That's right. Repeat function repeats the given string. And, the concatenation operator combines the strings.
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## What's the result of this expression?
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```go
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strings.ToUpper("bye bye ") + "see you!"
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```
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1. `bye bye see you!`
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2. `BYE BYE SEE YOU!`
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3. `bye bye + see you!`
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4. `BYE BYE see you!` *CORRECT*
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> 1. You missed the ToUpper?
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> 2. You're close but look closely. ToUpper only changes the first part of the string there.
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> 3. Not even close. Sorry.
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> 4. Perfect! Good catch! ToUpper only changes the first part of the string there.
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