To convert this_is_a_variable to thisisavariable, call the string replace() method. You have to pass regular expression `/_/g` as the first argument and empty string "" as the second argument to the replace() method.
The following JavaScript code converts this_is_a_variable to thisisavariable:
let str = "this_is_a_variable"; str = str.replace(/_/g, ''); console.log(str); //thisisavariable
The g flag replaces all the occurrences of underscore with the empty string.
You might think why we have passed regular expression. The reason for using this is that if you pass "_" to the replace() method then only the first occurrence of underscore (_) is replaced with an empty string. To replace all the occurrences of underscore, you have to specify a regular expression with the g flag.
let str = "this_is_a_variable";
str = str.replace("_", "");
console.log(str); //thisis_a_variable
