Stack Overflow Asked by Michael Nascimento on December 30, 2021
I’m trying to create a recursive function that returns an array of interger in a range of numbers.
If I use a ternary operator, the base case returns ‘undefined’. I can’t see where is the problem.
Using JSLint I get this message: "Wrap a ternary expression in parens, with a line break after the left paren."
The code:
function rangeOfNumbers(startNum, endNum) {
return startNum === endNum
? startNum
: rangeOfNumbers(startNum, endNum - 1).concat(endNum);
}
In your original example, you were just returning startNum which is a number. Instead, we want to return an array containing the startNum so we can concatenate that value when returned.
Try this:
function rangeOfNumbers(startNum, endNum) {
return startNum === endNum
? [startNum]
: rangeOfNumbers(startNum, endNum - 1).concat(endNum);
}
Answered by rhigdon on December 30, 2021
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