JavaScript: String object

Methods and properties

`prototype.at()`
`fromCharCode()`
`fromCodePoint()`
`length`
`prototype.charAt()`
`prototype.charCodeAt()`
`prototype.codePointAt()`
`prototype.concat()`
`prototype.endsWith()`
`prototype.includes()`
`prototype.indexOf()`
`prototype.lastIndexOf()`
`prototype.localeCompare()`
`prototype.match()`
`prototype.matchAll()`
`prototype.normalize()`
`prototype.padEnd()`
`prototype.padStart()`
`prototype.repeat()`
`prototype.replace()`
`prototype.replaceAll()`
`prototype.search()`
`prototype.slice()`	Returns a substring from a string. Compare with the `slice()` method of the `Array` object.
`prototype.split()`
`prototype.startsWith()`
`prototype.substr()`	Deprecated
`prototype.substring()`
`prototype.toLocaleLowerCase()`
`prototype.toLocaleUpperCase()`
`prototype.toLowerCase()`
`prototype.toString()`
`prototype.toUpperCase()`
`prototype.trim()`
`prototype.trimEnd()`
`prototype.trimStart()`
`prototype.valueOf()`
`prototype[@@iterator]()`
`raw()`

The following wrapper embed the string into the corresponding representation of an HTML elements. Thes functions are deprecated:

prototype.anchor()
prototype.big(), prototype.small()
prototype.blink()
prototype.bold(), prototype.italics()
prototype.fixed()
prototype.fontcolor(), prototype.fontsize()
prototype.link()
prototype.strike()
prototype.sub(), prototype.sup()

charAt

<!DOCTYPE html>
<html>
<head>
  <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
  <title>String.charAt</title>

  <script type="text/javascript">
    
    function main() {

      var out = document.getElementById('out');

                   //  012345679
      out.innerHTML = "abcdefghi".charAt(5);  // f
      
    }

  </script>

</head>
<body onload='main()';>
  <div id='out'></div> 
</body>
</html>

Github repository about-javascript, path: /objects/String/charAt.html

slice

slice() returns a substring from a string.

str.slice(from);
str.slice(from, to);

from and to can be negative numbers in which case they're counted from the end of the string.

toUpperCase

Convert a string to upper case.

<!DOCTYPE html>
<html>
<head>
  <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
  <title>String.toUpperCase()</title>

  <script type="text/javascript">
    
    function main() {
    
      var out = document.getElementById('out');

      out.innerHTML = "foo bar baz".toUpperCase();

    }

  </script>

</head>
<body onload='main()';>
  <div id="out"></div>
</body>
</html>

Github repository about-javascript, path: /objects/String/toUpperCase.html

fromCharCode

String.fromCharCode creates a string from one ore more Unicode codepoints, see here.

determineType

<!DOCTYPE html>
<html>
<head>
  <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
  <title>Determine type of String instance</title>

  <script type="text/javascript">
    
    function main() {
      str = 'Hello world';

      document.getElementById('type').innerHTML = Object.prototype.toString.call(str);

    }

  </script>

</head>
<body onload='main()';>

  The »type« of <code>'Hello world'</code> is: <code><span id='type'></span></code>

</body>
</html>

Github repository about-javascript, path: /objects/String/determineType.html