Four new usages of strings in Javascript6 sharing _javascript tips

Here are four new uses of strings in JAVASCRIPT6:

A new representation method for Unicode characters

Unicode characters are usually 21 bit, while ordinary JavaScript characters (most) are 16bit and can be encoded into UTF-16. Characters exceeding 16bit are required to be represented in 2 regular characters.

For example, the following code will output a Unicode small rocket character (' \ud83d\ude80 ') that you can try in the browser console:

  Console.log (' \ud83d\ude80 ');

In ECMAScript 6, you can use the new presentation method, which is more concise:

  Console.log (' \u{1f680} ');

Two, multiline string definitions and template strings

The template string provides three useful syntax features.

First, the template string supports embedded string variables:

  let-i = ' Jane ';
  Let-last = ' Doe ';
  Console.log (' Hello ${first} ${last}! ');
    Hello Jane doe!

Second, the template string supports the direct definition of multiple-line strings:

  Let MultiLine = ' It is
  a string with
  multiple
  lines ';

Third, if you String.raw prefix the string, the string will remain in its original state. The backslash (\) does not represent escape, and other professional characters, such as \ n, will not be escaped:

  Let raw = String.raw ' not a newline: \ n ';
  Console.log (Raw = = ' Not a newline: \\n '); True

Third, loop traversal string

Strings can traverse loops, and you can use for-of each character in the loop string:

  for (Let ch ' abc ') {
    console.log (ch);
  }
  Output:
  //a
  //b
  //C

Also, you can split a string into a character array using the split character (...):

  Let chars = [... ' abc '];
    [' A ', ' B ', ' C ']

Four, string contains the judgment and duplicate string

There are three new ways to check whether a string contains another string:

  > ' Hello '. StartsWith (' hell ')
  true
  > ' Hello '. EndsWith (' Ello ')
  true
  > ' Hello '. Includes (' Ell ')
  true

These methods have an optional second parameter that indicates the starting position of the search:

  > ' Hello '. StartsWith (' Ello ', 1)
  true
  > ' Hello '. EndsWith (' hell ', 4)
  true
  
  > ' Hello '. Includes (' ell ', 1)
  true
  > ' Hello '. Includes (' ell ', 2)
  false

repeat()method to duplicate a string:

  > ' Doo ' repeat (3)
  ' doo doo doo '

Summarize

This is the four new usage of the string in Javascript6, has everybody learned it? I hope this article can be helpful to everyone, if you have any questions, you can message exchange.