By Matt Doyle
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Additional resources for Beginning PHP 5.3
In this chapter we are going to start to look at how we can introduce names and associate them with values in SML. SML provides a variety of ways of associating names with values and we will discuss four in this book. Global declarations, which we will meet shortly, are a simple way of associating names and values for the duration of an SML session. Functions, which we will consider in some detail for most of this chapter, are expression abstractions where a formal parameter, a name, identifies the abstraction point.
0 kilograms: there is no point in checking any other cats so we stop with the final check as “false”. Once again we start with the initial collection. The collection is not empty. 8 The collection is not empty. 8 The collection is not empty. 0 kilograms so we deal with the rest of the collection: Initial collection name colour The collection is empty so the final check is “true” to begin with: Final check true So the final check is “true”: Final check true So the final check is "true": weight 20 INTRODUCTION Final check true So the final check is “true”: Final check true Once again, we wound our way down through the collection but this time we passed a boolean value back up.
We can explain how andalso behaves with the following truth table. Here X and Y stand for arbitrary truth values. The table shows all possible combinations of values of X and Y, and the final values of X andalso Y: X false false true true Y false true false true X andalso Y false false false true Note that the result is true only when both X and Y are true. Otherwise, the result is false. For example: – true andalso false; > false : bool In this function application with an infix operator, the operands are true and false.