Given a string representing constant name (upper case words separated by underscore eg FOO_BAR) implement a function which converts it into variable name (eg. fooBar):

• convert first word to lowercase
• convert next words to lowercase, but first character is still uppercase
• remove all underscore characters

Challenge | Solution

decapitalizeConst("FOO") // foo

decapitalizeConst("FOO_BAR") // fooBar

decapitalizeConst("__FOO_BAR_BAZ") // fooBarBaz