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May 1, 2020 15:43
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ES6 Filter, Sort, Map method chaining
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| /* PRINT OUT TO THE CONSOLE, | |
| AN ORDERED LIST OF "ACTIVE" USERS, | |
| BY ASENDING SURNAME (ie A, B, C), | |
| WITH A STRING SHOWING USERS FULL NAME AND AGE TO WHOLE NUMBER | |
| ie | |
| "Jerry Brie is 80 years old." | |
| "Mickey Jacobs is 92 years old." | |
| "Tom Oswalt is 80 years old." | |
| */ | |
| const USERS = [ | |
| { name: "Troy Barnes", dob: "1989-12-04", active: false }, | |
| { name: "Abed Nadir", dob: "1979-03-24", active: true }, | |
| { name: "Jeff Winger", dob: "1974-11-20", active: true }, | |
| { name: "Pierce Hawthorne", dob: "1944-11-27", active: false }, | |
| { name: "Annie Edison", dob: "1990-12-19", active: true }, | |
| { name: "Britta Perry", dob: "1980-10-19", active: true }, | |
| { name: "Shirley Bennett", dob: "1971-08-12", active: false }, | |
| { name: "Professor Professorson", dob: "1969-03-27", active: false }, | |
| { name: "Craig Pelton", dob: "1971-07-15", active: true }, | |
| ]; | |
| //calculate age from dob | |
| const getAge = (birthDate) => | |
| Math.floor((new Date() - new Date(birthDate).getTime()) / 3.15576e10); | |
| /** | |
| * | |
| * Chained methods= [ | |
| * filter active users, | |
| * then sort users by their las name, | |
| * then console log result | |
| * ] | |
| * | |
| */ | |
| const sortActiveUsersByLastName = (users) => { | |
| users | |
| .filter((user) => user.active === true) | |
| .sort((a, b) => (a.name.split(" ")[1] > b.name.split(" ")[1] ? 1 : -1)) | |
| .map((user) => { | |
| const dob = getAge(user.dob); | |
| console.log(`${user.name} is ${dob} years old `); | |
| }); | |
| }; | |
| //call the function | |
| sortActiveUsersByLastName(USERS); | |
| /** | |
| * Should output, | |
| * Annie Edison is 29 years old, | |
| * Abed Nadir is 41 years old, | |
| * Craig Pelton is 48 years old, | |
| * Britta Perry is 39 years old, | |
| * Jeff Winger is 45 years old, | |
| */ |
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