Referensi JavaScript

Tentang Referensi Ini

Pengalaman menggunakan bahasa pemrograman lainnya dapat menjadi manfaat, meskipun tidak menjadi prasyarat.

JavaScript ditujukan untuk digunakan pada lingkup yang lebih besar, seperti peramban, script server-side, atau sejenisnya. Secara umum, pustaka ini tergantung pada platform tertentu, dan tidak ditujukan hanya untuk peramban.

Untuk tujuan demo, pustakan ini menggunakan fungsi, println. Fungsi tersebut bukanlah bagian dari JavaScript. Namun ia dapat dipetakan terhadap implementasi spesifik pada platform tertentu.

Misal, bila berjalan di peramban, maka fungsi di atas dapat implementasikan sebagai:

function println(string) {
  window.alert(string);
}

Sejarah JavaScript

Versi terbaru dari peramban berbasis Mozilla mendukung versi terbaru dari JavaScript. Tabel berikut menampilkan daftar dari versi JavaScript yang didukung oleh versi yang berbeda dari peramban berbasis Mozilla.

Peramban yang tidak mendukung versi JavaScript setidaknya versi 1.5 adalah hal yang sangat langka untuk saat ini. JavaScript versi 1.5 sudah dipublikasikan sejak tahun 1999. Bila Anda tertarik untuk mempelajari sejarahnya, silahkan mengunjungi referensi yang terdapat di Wikipedia, ECMAScript.

JavaScript/Browser support history

Sumber informasi JavaScript

Dokumentasi JavaScript dari fitur bahasa inti (murni ECMAScript, untuk sebagian besar) mencakup:

• Pedoman JavaScript
• Referensi JavaScript

Bila Anda masih baru terhadap JavaScript, mulailah dari pedoman. Bila kemudian Anda sudah merasa memiliki pemahaman yang lebih mendalam, Anda dapat memanfaatkan referensi.

Objek Global

General-purpose constructors

• Array
• Boolean
• Date
• Function
• Iterator
• Number
• Object
• RegExp
• String
• Proxy
• ParallelArray

Typed array constructors

• ArrayBuffer
• DataView
• Float32Array
• Float64Array
• Int16Array
• Int32Array
• Int8Array
• Uint16Array
• Uint32Array
• Uint8Array
• Uint8ClampedArray

Internationalization constructors

• Intl.Collator
• Intl.DateTimeFormat
• Intl.NumberFormat

Error constructors

• Error
• EvalError
• InternalError
• RangeError
• ReferenceError
• StopIteration
• SyntaxError
• TypeError
• URIError

Non-constructor functions

• decodeURI
• decodeURIComponent
• encodeURI
• encodeURIComponent
• eval
• isFinite
• isNaN
• parseFloat
• parseInt
• uneval

Other

• Infinity
• Intl
• JSON
• Math
• NaN
• undefined
• null

Fungsi dan jangkauannya

• arguments
• Strict mode

Pernyataan

JavaScript statements terdiri atas keywords yang digunakan sesuai dengan sintax yang berlaku. Panjang dari satu statement dapat melebihi satu baris kode. Statement ganda dapat berada pada satu baris yang sama bila tiap statement dipisahkan oleh semicolon.

block

Block digunakan untuk mengelompokkan 0 atau lebih statement. Block dibuka dan ditutup oleh sepasang { }.

Operator dan kata kunci lainnya

This chapter documents all the JavaScript language operators, expressions and keywords.

Expressions and operators by category

For an alphabetical listing see the sidebar on the left.

Primary expressions

Basic keywords and general expressions in JavaScript.

this

The this keyword refers to the function's execution context.

function

The function keyword defines a function expression.

class

The class keyword defines a class expression.

function*

The function* keyword defines a generator function expression.

yield

Pause and resume a generator function

yield*

Delegate to another generator function or iterable object.

[]

Array initializer/literal syntax.

{}

Object initializer/literal syntax.

/ab+c/i

Regular expression literal syntax.

[for (x of y) x]

Array comprehensions.

(for (x of y) y)

Generator comprehensions.

( )

Grouping operator.

Left-hand-side expressions

Left values are the destination of an assignment.

Property accessors

Member operators provide access to a property or method of an object
(object.property and object["property"]).

new

The new operator creates an instance of a constructor.

super

The super keyword calls the parent constructor.

...obj

The spread operator allows an expression to be expanded in places where multiple arguments (for function calls) or multiple elements (for array literals) are expected.

Increment and decrement

Postfix/prefix increment and postfix/prefix decrement operators.

A++

Postfix increment operator.

A--

Postfix decrement operator.

++A

Prefix increment operator.

--A

Prefix decrement operator.

Unary operators

A unary operation is operation with only one operand.

delete

The delete operator deletes a property from an object.

void

The void operator discards an expression's return value.

typeof

The typeof operator determines the type of a given object.

+

The unary plus operator converts its operand to Number type.

-

The unary negation operator converts its operand to Number type and then negates it.

~

Bitwise NOT operator.

!

Logical NOT operator.

Arithmetic operators

Arithmetic operators take numerical values (either literals or variables) as their operands and return a single numerical value.

+

Addition operator.

-

Subtraction operator.

/

Division operator.

*

Multiplication operator.

%

Remainder operator.

Relational operators

A comparison operator compares its operands and returns a Boolean value based on whether the comparison is true.

in

The in operator determines whether an object has a given property.

instanceof

The instanceof operator determines whether an object is an instance of another object.

<

Less than operator.

>

Greater than operator.

<=

Less than or equal operator.

>=

Greater than or equal operator.

Equality operators

The result of evaluating an equality operator is always of type Boolean based on whether the comparison is true.

==

Equality operator.

!=

Inequality operator.

===

Identity operator.

!==

Nonidentity operator.

Bitwise shift operators

Operations to shift all bits of the operand.

<<

Bitwise left shift operator.

>>

Bitwise right shift operator.

>>>

Bitwise unsigned right shift operator.

Binary bitwise operators

Bitwise operators treat their operands as a set of 32 bits (zeros and ones) and return standard JavaScript numerical values.

&

Bitwise AND.

|

Bitwise OR.

^

Bitwise XOR.

Binary logical operators

Logical operators are typically used with boolean (logical) values, and when they are, they return a boolean value.

&&

Logical AND.

||

Logical OR.

Conditional (ternary) operator

(condition ? ifTrue : ifFalse)

The conditional operator returns one of two values based on the logical value of the condition.

Assignment operators

An assignment operator assigns a value to its left operand based on the value of its right operand.

=

Assignment operator.

*=

Multiplication assignment.

/=

Division assignment.

%=

Remainder assignment.

+=

Addition assignment.

-=

Subtraction assignment

<<=

Left shift assignment.

>>=

Right shift assignment.

>>>=

Unsigned right shift assignment.

&=

Bitwise AND assignment.

^=

Bitwise XOR assignment.

|=

Bitwise OR assignment.

[a, b] = [1, 2]
{a, b} = {a:1, b:2}

Destructuring assignment allows you to assign the properties of an array or object to variables using syntax that looks similar to array or object literals.

Comma operator

,

The comma operator allows multiple expressions to be evaluated in a single statement and returns the result of the last expression.

Non-standard features

Legacy generator function

The function keyword can be used to define a legacy generator function inside an expression. To make the function a legacy generator, the function body should contains at least one yield expression.

Expression closures

The expression closure syntax is a shorthand for writing simple function.

Specifications

See also

• Operator precedence

Komentar

• Komentar kode (// and /* */)

E4X (ekstensi)

Global statements:

• default XML namespace

Global functions:

• isXMLName()

Global constructors:

• Namespace()
• QName()
• XML()
• XMLList()

Lampiran A - Kata Terpesan

Lampiran B - Fitur Terprotes

Original Document At: http://devedge-temp.mozilla.org/libr...1.5/reference/