JavaScript Objects, Classes and Prototypes - University of Southampton
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JavaScript: Objects & Classes
...and functions and arrays They're all the same really.
JavaScript Objects
? A JavaScript object has properties associated with it.
objectName.propertyName
? Define a property by assigning it a value
myCar.make = "Ford"; !myCar.model = "Mustang";! myCar.year = 1969;
JavaScript Arrays, err, Objects
? An array is an ordered set of values associated with a single variable name.
? Properties and arrays are different interfaces to the same data structure.
myCar["make"] = "Ford"! myCar["model"] = "Mustang" !myCar["year"] = 1967
? NB array subscripts can contain illegal object property characters e.g. space
Creating an Array
? Either use an array constructor
arrayObjectName = new Array(element0, element1, ...)! arrayObjectName = new Array(arrayLength)
? Or use an array literal
coffees = ["French Roast", "Columbian", "Kona"]
? Predefined array field
array.length current maximum size of array.
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