Week 05 Day 2 - Function Junction

[gstark]

Objectives

After completing this assignment, you should be able to:

• Demonstrate understanding of types, functions, argument-handling, loops, and conditional statements

Requirements

1. Fork this repository to your own account.
2. Change into your training directory
3. Clone your repository: hub clone function-junction
4. Change into your project's directory: cd function-junction
5. Install the dependencies: yarn install (or just yarn for short)
6. Open in Code: code .
7. Start the test runner: yarn test
8. Open src/functions.test.js and work on functions until tests pass.
9. Commit and push your work to GitHub.
10. Turn in the URL to your GitHub repo.

Explorer Mode

• [ ] All tests passing
• [ ] No linter warnings
• [ ] Turn in the homework using the URL to your repository on Github.

Adventure Mode

• [ ] If you used "built-in" JavaScript methods like String.reverse() or Array.max() to solve these problems, try implementing them from scratch.
• [ ] Vice-versa: if you implemented your solutions from scratch, look in the documentation linked below to see if JavaScript has any built-in functions to help solve these problems.

Epic Mode

• [ ] Expand the sum and max functions to take arrays instead of numbers and update the tests so they pass.
• [ ] Create your own simple functions with tests.
• [ ] Anytime in your code that you used a for loop or a while loop, convert it to use a map, filter or reduce.

Additional Resources

Reference the documentation on MDN to find what kind of helpful functions might already be on Array and String in JavaScript.

• String Functions on MDN.
• Array Functions on MDN.

[JOLee83]

https://github.com/JOLee83/function-junction.git

[gstark]

Good work

for sumOfArray see if you can use one of the iterating functions.

    if (
        x === 'a' ||
        x === 'A' ||
        x === 'e' ||
        x === 'E' ||
        x === 'i' ||
        x === 'I' ||
        x === 'o' ||
        x === 'O' ||
        x === 'u' ||
        x === 'U'
    ) {
        return true
    } else {
        return false
    }
}

can be

function isVowel(x) {
    return (
        x === 'a' ||
        x === 'A' ||
        x === 'e' ||
        x === 'E' ||
        x === 'i' ||
        x === 'I' ||
        x === 'o' ||
        x === 'O' ||
        x === 'u' ||
        x === 'U'
    )
}

since

if (condition) {
  return true
} else {
  return false
}

is the same as

return (condition)

Do you understand how !!~'aeiou'.indexOf(letter) works? We haven't covered this in class so I want to make sure you understand the idiom if you are going to use it.

function reverse(x) {
    let x2 = x.split('')
    let x3 = x2.reverse()
    let x4 = x3.join('')
    return x4
}

You don't need all those temp variables. you can just do x.split('').reverse().join('')

also try to use more expressive variable names than x or a and b

[gstark]

Your homework is: Meets Expectations