获取姓名的首字母，但姓氏除外 - JavaScript

Question

I used the following code to extract initials and work fines, but it extracts last name initial as well.

 String.prototype.getInitials = function(glue) { if (typeof glue == "undefined") { var glue = true; } var initials = this.replace(/[^a-zA-Z- ]/g, "").match(/\b\w/g); if (glue) { return initials.join('.'); } return initials; }; console.log("first middle last".getInitials());

How to remove last letter please?

Answer 1

Ignore the last index while joining. Also added some safety check using optional chaining so it doesn't return undefined.

 String.prototype.getInitials = function(glue) { if (typeof glue == "undefined") { var glue = true; } var initials = this.replace(/[^a-zA-Z- ]/g, "").match(/\b\w/g)?.slice(0, -1)?? []; if (glue) { return initials.join('.')?? ""; } return initials; }; console.log("my name is".getInitials());