Modify cases for strings

Modify the case of the string.

string_upper(s)
string_lower(s)
string_swapcase(s)
string_titlecase(s)

Arguments

s	A string (character) vector.

Value

Character vector.

Details

The upper() functions make all characters in a string vector in their capitalized case.

The string_lower() function makes the same vector in their lower case.

The string_swapcase() function switches the case for each character in a string vector.

The string_titlecase() function converts the first character of each word to uppercase.

The synonym pattern of these functions are s_*() and *() (replace asterisks with upper, lower, swapcase, or titlecase).

See also

https://github.com/robertschnitman/stringops

Examples

string_upper(rownames(mtcars))
#>  [1] "MAZDA RX4"           "MAZDA RX4 WAG"       "DATSUN 710"         
#>  [4] "HORNET 4 DRIVE"      "HORNET SPORTABOUT"   "VALIANT"            
#>  [7] "DUSTER 360"          "MERC 240D"           "MERC 230"           
#> [10] "MERC 280"            "MERC 280C"           "MERC 450SE"         
#> [13] "MERC 450SL"          "MERC 450SLC"         "CADILLAC FLEETWOOD" 
#> [16] "LINCOLN CONTINENTAL" "CHRYSLER IMPERIAL"   "FIAT 128"           
#> [19] "HONDA CIVIC"         "TOYOTA COROLLA"      "TOYOTA CORONA"      
#> [22] "DODGE CHALLENGER"    "AMC JAVELIN"         "CAMARO Z28"         
#> [25] "PONTIAC FIREBIRD"    "FIAT X1-9"           "PORSCHE 914-2"      
#> [28] "LOTUS EUROPA"        "FORD PANTERA L"      "FERRARI DINO"       
#> [31] "MASERATI BORA"       "VOLVO 142E"         
string_lower(rownames(mtcars))
#>  [1] "mazda rx4"           "mazda rx4 wag"       "datsun 710"         
#>  [4] "hornet 4 drive"      "hornet sportabout"   "valiant"            
#>  [7] "duster 360"          "merc 240d"           "merc 230"           
#> [10] "merc 280"            "merc 280c"           "merc 450se"         
#> [13] "merc 450sl"          "merc 450slc"         "cadillac fleetwood" 
#> [16] "lincoln continental" "chrysler imperial"   "fiat 128"           
#> [19] "honda civic"         "toyota corolla"      "toyota corona"      
#> [22] "dodge challenger"    "amc javelin"         "camaro z28"         
#> [25] "pontiac firebird"    "fiat x1-9"           "porsche 914-2"      
#> [28] "lotus europa"        "ford pantera l"      "ferrari dino"       
#> [31] "maserati bora"       "volvo 142e"         
string_swapcase(rownames(mtcars))
#>  [1] "mAZDA rx4"           "mAZDA rx4 wAG"       "dATSUN 710"         
#>  [4] "hORNET 4 dRIVE"      "hORNET sPORTABOUT"   "vALIANT"            
#>  [7] "dUSTER 360"          "mERC 240d"           "mERC 230"           
#> [10] "mERC 280"            "mERC 280c"           "mERC 450se"         
#> [13] "mERC 450sl"          "mERC 450slc"         "cADILLAC fLEETWOOD" 
#> [16] "lINCOLN cONTINENTAL" "cHRYSLER iMPERIAL"   "fIAT 128"           
#> [19] "hONDA cIVIC"         "tOYOTA cOROLLA"      "tOYOTA cORONA"      
#> [22] "dODGE cHALLENGER"    "amc jAVELIN"         "cAMARO z28"         
#> [25] "pONTIAC fIREBIRD"    "fIAT x1-9"           "pORSCHE 914-2"      
#> [28] "lOTUS eUROPA"        "fORD pANTERA l"      "fERRARI dINO"       
#> [31] "mASERATI bORA"       "vOLVO 142e"