JavaScript Examples Bible - UserWorks Technologies

Chapter 16 ✦ String and Number Objects (Chapters 34 and 35)
Figure 16-1: Conversions from text characters to ASCII values and
vice versa
string.indexOf(searchString [, startIndex])
NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5
Compatibility ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Example
Enter each of the following statements (up to, but not including the “//” comment
symbols) into the top text box of The Evaluator (you can simply replace the parameters
of the indexOf() method for each statement after the first one). Compare
your results with the results shown below.
a = “bananas”
a.indexOf(“b”) // result = 0 (index of 1st letter is zero)
a.indexOf(“a”) // result = 1
a.indexOf(“a”,1) // result = 1 (start from 2nd letter)
a.indexOf(“a”,2) // result = 3 (start from 3rd letter)
a.indexOf(“a”,4) // result = 5 (start from 5th letter)
a.indexOf(“nan”) // result = 2
a.indexOf(“nas”) // result = 4
a.indexOf(“s”) // result = 6
a.indexOf(“z”) // result = -1 (no “z” in string)
473
stringObject.indexOf()