Introduction to Swift: Array

Array is an Ordered Collection Type and array is used to organize data where in some instances used to hold elements of single type.

CREATE ARRAY WITH VALUE

In order to create an array, you could do either of these:

or

The examples above uses let which means you won’t be able to modify it’s content. If you would like modify it’s content such as adding or removing, consider using var. Anyway, spot the differences between Int and String in the use of array. String requires the use of double quotation while Int does not. These are also array with value meaning numbers array contains 1, 2, 3, 4, 5 while names array contains Kelvin, Beam and Lexton.

CREATE AN EMPTY ARRAY

We’ve seen how to create array with value in it. Now let’s create array without any value in it. The code below basically means, this is an array of Int only. And if you try adding String in it, it will crash.

ADDING INTO ARRAY

Let’s say we would like to add some numbers into our array. We’ve added 10 into our array and now our array should be containing only 10.

And if we would like to add more, we could simply add more with the command of append.

Now our array should contain 10, 11 and 13.

REMOVING FROM ARRAY

Remember that in array, the first number is always 0 and this is how we retrieve the value of the array.  Let’s say we would like to remove 10 from the array, we could do this.

And if we would like to remove 11, we could do. Now if we have already remove 10, then 11 would decrement into 0 instead of 1.

 

  • Article By :
    Founder of DaddyCoding. Studied Computer Science, Information System and Information Technology at BYU-Hawaii. Currently spending most of my time researching and learning on helping to expose making iOS apps.

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