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Randell Dawson 1494a50123 fix(guide): restructure curriculum guide articles (#36501 )

* fix: restructure certifications guide articles
* fix: added 3 dashes line before prob expl
* fix: added 3 dashes line before hints
* fix: added 3 dashes line before solutions

2019-07-24 13:29:27 +05:30

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title

title
Use Destructuring Assignment with the Rest Parameter to Reassign Array Elements

Use Destructuring Assignment with the Rest Parameter to Reassign Array Elements

Problem Explanation

Remember that the rest parameter allows for variable numbers of arguments. In this challenge, you have to get rid of the first two elements of an array.

Hints

Hint 1

Assign the first two elements to two random variables.

Hint 2

Set the remaining part of the array to ...arr.

Hint 3

Use destructuring to create the arr variable:

function removeFirstTwo(list) {
  "use strict";
  // change code below this line
  const [arr] = list; // change this
  // change code above this line
  return arr;
}

Hint 4:

Spread the list parameter values into arr.

function removeFirstTwo(list) {
  "use strict";
  // change code below this line
  const [...arr] = list; // change this
  // change code above this line
  return arr;
}

You can use random variables to omit the first two values:

Solutions

Solution 1 (Click to Show/Hide)

const source = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
function removeFirstTwo(list) {
  "use strict";
  // change code below this line
  const [a, b, ...arr] = list;
  // change code above this line
  return arr;
}
const arr = removeFirstTwo(source);
console.log(arr); // should be [3,4,5,6,7,8,9,10]
console.log(source); // should be [1,2,3,4,5,6,7,8,9,10];

You can also exclude the first two elements of the arr array using ,,.

Relevant Links

"Destructuring assignment" - MDN JavaScript reference

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