Convert dash-separated string to camelCase?

Question

For example suppose I always have a string that is delimited by \"-\". Is there a way to transform

it-is-a-great-day-today

to

itIsAGreatDayToday

Answer 1

var string = "it-is-a-great-day-today";
or
var string = "it_is_a_great_day_today";

var regex = /(_|-)([a-z])/g;

string.toLowerCase().replace(regex, toCamelCase );

function toCamelCase( string ){
  return string[1].toUpperCase();
}

Output: "itIsAGreatDayToday";