tutorial 4: string handling

Notes

• String variables are text variables
• Strings cannot be used in mathematical calculations
• Strings can be used in identity comparisons, but not relative ones
• JavaScript includes many useful methods for string handling

Resources

• starting template - download and open in Notepad or view the source code and copy into a new file to save as an HTML file.
• String handling Methods

JavaScript Commands

toString()

method that converts a number to a string

.length

property that returns the length of a string. Use example:

var x = "some string";

var y = x.length;

indexOf()

method that returns the numerical index value of the first character of a specific string that is sent as a parameter. Use example:

y = x.indexOf("string");

substr(start, length)

method that extracts part of a string from a start value and of a specified length.

slice(start, end)

method that extracts part of a string from the start value to the end value.

replace (original, replacewith)

method that replaces the first instance of a string with another string.