In some situations we are required to take a value that was intended to be a string and convert it to a numerical value for calculations.
In this situation we would implement a form of variable control called "Casting".
CODE:
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//String
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var string = "5.00";
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//What would happen if we wanted to add another 5.00 to string?
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//Well, it would append the 5.00 to the original 5.00 - Example: 5.005.00
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//We need to Cast "string" so that we can do numerical calculations.
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var numeric = parseFloat(string)+5.00;
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//You can use
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//parseFloat - number with a decimal point.
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//parseInt - whole number.
Simple and effective.