5.3 KiB
title |
---|
Mutations |
Remember to use Read-Search-Ask
if you get stuck. Try to pair program and write your own code
Problem Explanation:
- Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array..
Relevant Links
Hint: 1
- If everything is lowercase it will be easier to compare.
try to solve the problem now
Hint: 2
- Our strings might be easier to work with if they were arrays of characters.
try to solve the problem now
Hint: 3
- A loop might help. Use
indexOf()
to check if the letter of the second word is on the first.
try to solve the problem now
Spoiler Alert!
Solution ahead!
Basic Code Solution:
Procedural
function mutation(arr) {
var test = arr[1].toLowerCase();
var target = arr[0].toLowerCase();
for (var i=0;i<test.length;i++) {
if (target.indexOf(test[i]) < 0)
return false;
}
return true;
}
Code Explanation:
First we make the two strings in the array lowercase. test
will hold what we are looking for in target
.
Then we loop through our test characters and if any of them is not found we return false
.
If they are all found, the loop will finish without returning anything and we get to return true
.
Relevant Links
Intermediate Code Solution:
Declarative
function mutation(arr) {
return arr[1].toLowerCase()
.split('')
.every(function(letter) {
return arr[0].toLowerCase()
.indexOf(letter) != -1;
});
}
Code Explanation:
Grab the second string, lowercase and turn it into an array; then make sure every one of its letters is a part of the lowercased first string.
Every
will basically give you letter by letter to compare, which we do by using indexOf
on the first string. indexOf
will give you -1 if the current letter
is missing. We check that not to be the case, for if this happens even once every
will be false.
Relevant Links
NOTES FOR CONTRIBUTIONS:
- DO NOT add solutions that are similar to any existing solutions. If you think it is similar but better, then try to merge (or replace) the existing similar solution.
- Add an explanation of your solution.
- Categorize the solution in one of the following categories — Basic, Intermediate and Advanced.
- Please add your username only if you have added any relevant main contents. ( DO NOT remove any existing usernames)
See
Wiki Challenge Solution Template
for reference.