javascript - 如何通过普通JavaScript中最快的方式检查字符串的最后一个字符是否为数字/数字？(How to check if last character of a string is a digit/number by the fastest way in plain JavaScript?)

Question

How to check if last character of a string is a digit/number in plain JavaScript?

(如何检查纯JavaScript中字符串的最后一个字符是否为数字/数字？)

 function endsWithNumber( str ){ return str.endsWith(); // HOW TO CHECK IF STRING ENDS WITH DIGIT/NUMBER ??? } var str_1 = 'Pocahontas'; var str_2 = 'R2D2'; if( endsWithNumber( str_1 ) ){ console.log( str_1 + 'ends with a number' ); } else { console.log( str_1 + 'does NOT end with a number' ); } if( endsWithNumber( str_2 ) ){ console.log( str_2 + 'ends with a number' ); } else { console.log( str_2 + 'does NOT end with a number' ); } 

Also I would like to know what would be the most fastest way?

(我也想知道最快的方法是什么？)

I guess it may sound ridiculous :D but in my usecase I will need this method veeery often so I think it could make a difference.

(我想这听起来很荒谬：D，但是在我的用例中，我经常需要这种方法，所以我认为这可能有所作为。)

  ask by RE666 translate from so

Answer 1

function endsWithNumber( str: string ): boolean {

    return str && str.length > 0 && str.charAt( str.length - 1 ).match( /[0-9A-Za-z]/ );
}