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The String.prototype
property represents the String
prototype object.
Property attributes of String.prototype |
|
---|---|
Writable | no |
Enumerable | no |
Configurable | no |
Description
All String
instances inherit from String.prototype
. Changes to the String
prototype object are propagated to all String
instances.
Properties
String.prototype.constructor
- Specifies the function that creates an object's prototype.
String.prototype.length
- Reflects the length of the string.
N
- Used to access the character in the Nth position where N is a positive integer between 0 and one less than the value of
length
. These properties are read-only.
Methods
Methods unrelated to HTML
String.prototype.charAt()
- Returns the character at the specified index.
String.prototype.charCodeAt()
- Returns a number indicating the Unicode value of the character at the given index.
String.prototype.codePointAt()
- Returns a non-negative integer that is the UTF-16 encoded code point value at the given position.
String.prototype.concat()
- Combines the text of two strings and returns a new string.
String.prototype.includes()
- Determines whether one string may be found within another string.
String.prototype.endsWith()
- Determines whether a string ends with the characters of another string.
String.prototype.indexOf()
- Returns the index within the calling
String
object of the first occurrence of the specified value, or -1 if not found. String.prototype.lastIndexOf()
- Returns the index within the calling
String
object of the last occurrence of the specified value, or -1 if not found. String.prototype.localeCompare()
- Returns a number indicating whether a reference string comes before or after or is the same as the given string in sort order.
String.prototype.match()
- Used to match a regular expression against a string.
String.prototype.normalize()
- Returns the Unicode Normalization Form of the calling string value.
String.prototype.padEnd()
- Pads the current string from the end with a given string to create a new string from a given length.
String.prototype.padStart()
- Pads the current string from the start with a given string to create a new string from a given length.
String.prototype.quote()
Wraps the string in double quotes (""
").String.prototype.repeat()
- Returns a string consisting of the elements of the object repeated the given times.
String.prototype.replace()
- Used to find a match between a regular expression and a string, and to replace the matched substring with a new substring.
String.prototype.search()
- Executes the search for a match between a regular expression and a specified string.
String.prototype.slice()
- Extracts a section of a string and returns a new string.
String.prototype.split()
- Splits a
String
object into an array of strings by separating the string into substrings. String.prototype.startsWith()
- Determines whether a string begins with the characters of another string.
String.prototype.substr()
- Returns the characters in a string beginning at the specified location through the specified number of characters.
String.prototype.substring()
- Returns the characters in a string between two indexes into the string.
String.prototype.toLocaleLowerCase()
- The characters within a string are converted to lower case while respecting the current locale. For most languages, this will return the same as
toLowerCase()
. String.prototype.toLocaleUpperCase()
- The characters within a string are converted to upper case while respecting the current locale. For most languages, this will return the same as
toUpperCase()
. String.prototype.toLowerCase()
- Returns the calling string value converted to lower case.
String.prototype.toSource()
- Returns an object literal representing the specified object; you can use this value to create a new object. Overrides the
Object.prototype.toSource()
method. String.prototype.toString()
- Returns a string representing the specified object. Overrides the
Object.prototype.toString()
method. String.prototype.toUpperCase()
- Returns the calling string value converted to uppercase.
String.prototype.trim()
- Trims whitespace from the beginning and end of the string. Part of the ECMAScript 5 standard.
String.prototype.trimLeft()
- Trims whitespace from the left side of the string.
String.prototype.trimRight()
- Trims whitespace from the right side of the string.
String.prototype.valueOf()
- Returns the primitive value of the specified object. Overrides the
Object.prototype.valueOf()
method. String.prototype[@@iterator]()
- Returns a new
Iterator
object that iterates over the code points of a String value, returning each code point as a String value.
HTML wrapper methods
These methods are of limited use, as they provide only a subset of the available HTML tags and attributes.
String.prototype.anchor()
<a name="name">
(hypertext target)String.prototype.big()
<big>
String.prototype.blink()
<blink>
String.prototype.bold()
<b>
String.prototype.fixed()
<tt>
String.prototype.fontcolor()
<font color="color">
String.prototype.fontsize()
<font size="size">
String.prototype.italics()
<i>
String.prototype.link()
<a href="url">
(link to URL)String.prototype.small()
<small>
String.prototype.strike()
<strike>
String.prototype.sub()
<sub>
String.prototype.sup()
<sup>
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. |
ECMAScript 5.1 (ECMA-262) The definition of 'String.prototype' in that specification. |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'String.prototype' in that specification. |
Standard | |
ECMAScript 2017 Draft (ECMA-262) The definition of 'String.prototype' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
See also
Documentlabels en -medewerkers
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