For an assignment I am supposed to write a recursive function that checks any integer for even or odd using N-2. If even returns true else returns false. But it returns undefined whenever a value is large enough to call itself. Please help!
function isEven(num) {
console.log("top of function num = " + num);// For Debugging
if (num == 0){
return true;
}
else if (num == 1){
return false;
}
else {
num -= 2;
console.log("num = " + num);
isEven(num);
}
}
console.log(isEven(0));
// → true
console.log(isEven(1));
// → false
console.log(isEven(8));
// → ??
Console Log Results:
top of function num = 0
true
top of function num = 1
false
top of function num = 8
num = 6
top of function num = 6
num = 4
top of function num = 4
num = 2
top of function num = 2
num = 0
top of function num = 0
undefined
You have forgotten the return statement before the recursive isEven(num) call.
See the snippet below:
function isEven(num) {
//console.log("top of function num = " + num);// For Debugging
if (num == 0){
return true;
}
else if (num == 1){
return false;
}
else {
num -= 2;
return isEven(num);
}
}
console.log('0 is even: ', isEven(0));
// → true
console.log('1 is even: ', isEven(1));
// → false
console.log('8 is even: ', isEven(8));Collected from the Internet
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