3.4 KiB
3.4 KiB
| title |
|---|
| Write Higher Order Arrow Functions |
Remember to use Read-Search-Ask if you get stuck. Try to pair program 
and write your own code 
Problem explanation:
We need to compute and square values from the realNumberArray and store them in the variable squaredIntegers using the map(), filter(), and/or reduce() functions.
Hint: 1
- You will need to
filter()therealNumberArrayfor positive integers (decimals are not integers).
try to solve the problem now
Hint: 2
- You will need to
map()the values from yourfilter()function to the variablesquaredIntegers.
try to solve the problem now
Hint: 3
- Remember the magic of chaining functions.
try to solve the problem now
Spoiler alert!
Solution ahead!
Code solution:
const squareList = (arr) => {
"use strict";
const squaredIntegers = arr.filter( (num) => num > 0 && num % parseInt(num) === 0 ).map( (num) => Math.pow(num, 2) );
return squaredIntegers;
};
// test your code
const squaredIntegers = squareList(realNumberArray);
console.log(squaredIntegers);
Code explanation:
Uses the operator filter() and map() functions to square all positive integers in a given array.
Alternative code solution:
// change code below this line
const squaredIntegers = arr.filter((param) => Number.isInteger(param) && param >= 0).map(x => x * x);
// change code above this line
Code explanation
This does basically the same but uses the isInteger() method to check the numbers.