The length
property represents the length of a string.
str.length
This property returns the number of code units in the string. , the string format used by JavaScript, uses a single 16-bit code unit to represent the most common characters, but needs to use two code units for less commonly-used characters, so it's possible for the value returned by length
to not match the actual number of characters in the string.
For an empty string, length
is 0.
The static property String.length
returns the value 1.
var x = 'Mozilla'; var empty = ''; console.log('Mozilla is ' + x.length + ' code units long'); /* "Mozilla is 7 code units long" */ console.log('The empty string has a length of ' + empty.length); /* "The empty string has a length of 0" */
Created by Mozilla Contributors, license: CC-BY-SA 2.5