Substring to Specific Character | 點燈坊

If we want to substring to a specific character, we can’t just use substring() to get the result.

Version

ECMAScript 2015

substring()

let s = 'B8棟'

let end = s.indexOf('棟')
s.substring(0, end) // ? B8

• indexOf()：get the index of the specific character
• substring()：substring the result without the specific character

Conclusion

• Since both parameters of substring() are index, we can use indexOf() to get the index of the specific character first

Reference

MDN, String.prototype.indexOf()
MDN, String.prototype.substring()