Our aim is to randomly display a text string from a set. It involves the following steps
var text_st = new Array("String1", "String2", "String3", "String4", "String5", "String6", "String7", "String8", "String9", "String10"); var l = text_st.length; var rnd_no = Math.floor(l*Math.random()); alert(text_st[rnd_no]);
Note: Array are zero-indexed, thus, we can use the value of variable l (length of the array) directly because we are using floor() to round down to an integer.
I have used this code on several web sites to display a random testimonial from a set. So each time the web page loads a testimonial is selected and displayed at random. The code can also be used to display a random quote or a greeting.
Hard disk storage capacities have been increasing over the years. The world's first hard disk, IBM 350 Disk File, could store 5MB of data was announced on 4th September 1956. The first 1TB drive appeared 51 years later in 2007. It took just a couple of years to double the capacity and the first 2GB drive came into the market in 2009. [more...]