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/**
*
@function
upper
*
@description
Will convert the entire string to uppercase letters.
*
@param
{
String
} str - The input string
*
@return
{
String
} Uppercase string
*
@example
upper("hello") => HELLO
*
@example
upper("He_llo") => HE_LLO
*/
const
upper
=
(
str
)
=>
{
if
(
typeof
str
!==
'string'
)
{
throw
new
TypeError
(
'Argument should be string'
)
}
return
str
.
replace
(
/
[
a
-
z
]
/
g
,
(
char
)
=>
String
.
fromCharCode
(
char
.
charCodeAt
(
)
-
32
)
)
}
export
default
upper
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