Algorithm Confirm the Ending

🏁 Problem Explanation:

The function is a whole Boolean operation. You need to return true if the first argument ends with the second argument. This means that for the problem script, it should return true for the confirmEnding('Bastian', 'n'); case.

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πŸ’¬ Hint: 1

Take a look at how substr() works. You will be trying to get the last Nth characters.

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πŸ’¬ Hint: 2

To get the Nth-to-Last character you will use length() and turn it into a negative number.

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πŸ’¬ Hint: 3

Check that you have the proper syntax and that you use === to compare.

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Spoiler Alert!


Solution ahead!

πŸ”° Basic Code Solution:

function confirmEnding(str, target) {
  return str.substr(-target.length) === target;

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Code Explanation:

The substr() method returns the characters in a string beginning at the specified location through the optional specified number of characters. substr operates through the end of the string if the second optional parameter is not specified. substr() calculates the index of first matching character from the string’s end if the specified location is negative. Using the - operator in front of target.length makes it negative.

We use the method substr() with the negative value of target's length to extract the ending segment of str of the same size as target, compare it to target, and then return the value of this boolean expression.

πŸ† Credits:

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Thanks @Rafase282 for your help with Algorithm: Confirm the Ending


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