Arrays
Arrays are used to store multiple values in a single variable, instead of declaring separate variables for each value.
Creating Arrays
To declare an array, define the variable type with square brackets:
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We have now declared a variable that holds an array of strings. To insert values to it, we can use an array literal - place the values in a comma-separated list, inside curly braces:
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To create an array of integers, you could write:
Access the Elements of an Array
You access an array element by referring to the index number.
This statement accesses the value of the first element in cars:
Change an Array Element
To change the value of a specific element, refer to the index number:
Array Length
To find out how many elements an array has, use the length property:
Loop Through an Array
You can loop through the array elements with the for loop, and use the length property to specify how many times the loop should run.
The following example outputs all elements in the cars array:
Dynamic Arrays
The dynamic array is a variable size list data structure. It grows automatically when we try to insert an element if there is no more space left for the new element. It allows us to add and remove elements. The array can change and grow or get samller on the run time.
In the example code on the left you see that Dynamic arrays are much more user friendly than Static arrays.