Optimum way to compare strings in JavaScript? [duplicate]

You can use the localeCompare() method.

string_a.localeCompare(string_b);

/* Expected Returns:

 0:  exact match

-1:  string_a < string_b

 1:  string_a > string_b

 */

Further Reading:

• MDN: String.prototype.localeCompare
• Stack Overflow – Is there a JavaScript strcmp()?
• Tutorials Point: JavaScript String – localeCompare() Method