JS Tutorials
JS Introduction
JS Syntax
JS Comments
JS Variables
JS Operators
JS Data Types
JS Functions
JS Objects
JS Numbers
JS Arrays
JS Array Methods
JS Booleans
JS Events
JS Strings
JS Dates
JS Maths
JS Objects
Object Definition
Object Properties
Object Methods
Object Display
Object Prototypes
Object Iterables
Object Sets
Object Maps
Object References
JS Functions
Function Definition
Function Parameters
Function Invocation
Function Call
Function Apply
Function ClosuresJS Classes
Class Intro
Class Inhertitance
Class Static
JS Async
JS Callbacks
JS Aysnchronous
JS Promises
JS ASync/Await
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JavaScript Iterables
Objects that can be iterated over with for..of are
called iterable.
Technically, iterables must implement the Symbol.iterator method.
Iterating Over a String
You can use a for..of loop to iterate over the elements of a
string:
Example
for (const x of "W3Schools") {
// code block to
be executed
}
Iterating Over an Array
You can use a for..of loop to iterate over the elements of
an Array:
Example
for (const x of [1,2,3,4,5] {
// code block to
be executed
}
JavaScript Iterators
The iterator protocol defines how to produce a sequence of values from an object.
An object becomes an iterator when it implements a next() method.
The next() method must return an object with two properties:
- value (the next value)
- done (true or false)