Passing a Predicate to a Routine
manueurofax
If you can have an example...
Keith Andersen
per Claude Ai....
Here's a practical example that demonstrates this concept:
```javascript
// This is the "routine" function that accepts a predicate as a parameter
function filterStudents(students, predicate) {
const results = [];
for (let student of students) {
// Here we "activate" or call the predicate function that was passed in
if (predicate(student)) {
results.push(student);
}
}
return results;
}
// Example usage with different predicates
function main() {
const studentList = [
{name: "Alice", grade: 90, subject: "Math"},
{name: "Bob", grade: 75, subject: "Science"},
{name: "Charlie", grade: 85, subject: "Math"},
{name: "Diana", grade: 95, subject: "History"}
];
// Predicate 1: Students with grades above 80
const highPerformers = filterStudents(studentList, function(student) {
return student.grade > 80;
});
Logger.log("High performers: " + JSON.stringify(highPerformers));
// Predicate 2: Math students
const mathStudents = filterStudents(studentList, function(student) {
return student.subject === "Math";
});
Logger.log("Math students: " + JSON.stringify(mathStudents));
}
```
In this example:
1. The `filterStudents` function is our "routine" that accepts a predicate function as its second parameter
2. The predicate functions are the anonymous functions that test a condition (grade > 80 or subject === "Math")
3. The routine "activates" the predicate by calling it with `predicate(student)` on each student
4. Based on whether the predicate returns true or false, the routine decides what to do
This pattern is powerful because it allows you to create a generalized function (the routine) that can behave differently based on the function (predicate) that's passed to it. You can reuse the routine with different predicates instead of writing separate functions for each type of filtering.
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DimuDesigns
manueurofax
thank you all...