Pads a string on both sides with the specified character, if it’s shorter than the specified length
.
- Use
String.prototype.padStart()
andString.prototype.padEnd()
to pad both sides of the given string. - Omit the third argument,
char
, to use the whitespace character as the default padding character.
代码实现
const pad = (str, length, char = ' ') =>
str.padStart((str.length + length) / 2, char).padEnd(length, char);
pad('cat', 8); // ' cat '
pad(String(42), 6, '0'); // '004200'
pad('foobar', 3); // 'foobar'