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export function hey(message) {
const speech = message.trimEnd();
if (speech == "") {
return "Fine. Be that way!";
}
const isQuestion = speech.endsWith("?");
const isShout = /[A-Z]{1}/.test(speech) && speech == speech.toUpperCase();
if (isShout) {
return isQuestion
? "Calm down, I know what I'm doing!"
: "Whoa, chill out!";
}
if (isQuestion) {
return "Sure.";
}
return "Whatever.";
In this approach you have a series of if statements using the private methods to evaluate the conditions.
As soon as the right condition is found, the correct response is returned.
Note that there are no else if or else statements.
If an if statement can return, then an else if or else is not needed.
Execution will either return or will continue to the next statement anyway.
The String trimEnd method is applied to the input to eliminate any whitespace at the end of the input.
If the string has no characters left, it returns the response for saying nothing.
The String method endsWith is used to determine if the input ends with a question mark.
Note that a null or undefined String would be different from a String of all whitespace.
A null or undefined String would raise a TypeError if trimEnd were applied to it.
The first half of the shout condition
/[A-Z]{1}/.test(speech);
is constructed from a regular expression pattern to ensure there is at least one uppercase letter character in the String.
This is because the second half of the condition tests that the uppercased input is the same as the input.
If the input were only "123" it would equal itself uppercased, but without letters it would not be a shout.
The uppercasing is done by using the String method toUpperCase.
If isShout is true, a ternary operator is used to return the response for whether isQuestion is also true,
or only isShout is true.
Shortening
Note that when the body of an if statement is a short single line, both the test expression and the body could be put on the same line, like so
if (speech == '') return 'Fine. Be that way!';
It may not comply with some coding styles, but your team preferences may allow it.
