Length of string in JavaScript

Question

The following string returns a length of 20 in Javascript, but why?

8080!\u001b[22m\u001b[32m\u001b[39m

Possible duplicate of Backward slash in String JavaScript doesn't count in length, why so? — snipsnipsnip
– snipsnipsnip, Commented Aug 28, 2019 at 8:19
@snipsnipsnip This post is about Unicode characters and the post you are referencing is about the backslash character specifically. — Richie Bendall
– Richie Bendall, Commented Aug 28, 2019 at 8:27

Richie Bendall · Accepted Answer · 2019-08-28 08:15:47Z

5

\u001b is the Unicode value for Escape which is counted as a single character. With that in mind, the length is 20.

answered Aug 28, 2019 at 8:15

Richie Bendall

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Comments

Djaouad · Accepted Answer · 2019-08-28 08:18:40Z

2

Your strings contains unicode escaped characters, this is the string character by character (using split):

var str = '8080!\u001b[22m\u001b[32m\u001b[39m';

console.log(str.split(''));

answered Aug 28, 2019 at 8:18

Djaouad

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lealceldeiro · Accepted Answer · 2019-09-01 06:49:37Z

2

When JavaScript interprets that string expression, the actual value is: (length 20).

See it below:

console.log('8080!\u001b[22m\u001b[32m\u001b[39m');

console.log('length:', '8080!\u001b[22m\u001b[32m\u001b[39m'.length);

answered Aug 28, 2019 at 8:16

lealceldeiro

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