csc 151 spring 2020 topic higher order procedures
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CSC 151 Spring 2020 Topic: Higher Order Procedures April 8, 2019 - PowerPoint PPT Presentation

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CSC 151 Spring 2020 Topic: Higher Order Procedures April 8, 2019 Day 28 Left-Section, Right-Section In the reading we introduced: left-section and right-section Whats going on!?!? 1. Sorry that came out of nowhere the readings used to

  1. CSC 151 Spring 2020 Topic: Higher Order Procedures April 8, 2019 Day 28

  2. Left-Section, Right-Section In the reading we introduced: left-section and right-section What’s going on!?!? 1. Sorry that came out of nowhere – the readings used to be structured differently. How does (left-section binary-proc arg1) work: 2. A way to define a new procedure - essentially using section without the <>

  3. Left-Section, Right-Section

  4. HOP Think about the answers to these questions: 1. What is a higher-order procedure? 2. What are some examples of higher-order procedures? 3. Why do we use higher-order procedures?

  5. HOP 1. What is a higher-order procedure? A procedure that takes another procedure as a parameter or returns a procedure as its final value. 2. What are some examples of higher-order procedures? Map – takes a procedure and a list, applies the procedure to each item in the list Reduce – applies a procedure to pairs of values in a list to combine with all vals Apply – run a procedure with a list of values used as parameters Left-section – fill in one parameter for a procedure 3. Why do we use higher-order procedures? It’s efficient for the programmer, and maybe also the computer. We might make fewer mistakes when we reuse code! Sometimes it’s how we create procedures.

  6. Lab Time Ezra wants to know, is it warm in your part of the world? He loves playing outside!

  7. Upcoming Work Submit all problems before the extras by Friday 4/10 at 10:30pm Central Time. Include 6P’s for: 3, 4, 5, To: csc-151-02-grader@grinnell.edu Subject: CSC 151-02 Lab 4/8 Assignment 6 due Thursday April 9 Exam 2 resubmission due April 10 (optional) Exam 3 will be posted on Friday

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