How to return
I am thinking about the ◆ part of the following two codes.
[1]
function rangeOfNumber(start,end){
if(start===end){
return [startNum];
} else {
var answer = rangeOfNumber(start, end-1);
◆ answer.push(end);
◆ return answer;
}
}
rangeOfNumber(5,8); // (4) [5,6,7,8]
.
[2]
function rangeOfNumber(start,end){
if(start===end){
return [start];
} else {
var answer = rangeOfNumber(start, end-1);
◆ return answer.push(end);
}
}
rangeOfNumber(5,8);
/* Error VM2477:6 Uncaught TypeError: answer.push is not a function
at rangeOfNumber(<anonymous>:6:17)
at rangeOfNumber (<anonymous>:5:16)
at<anonymous>:9:1*/
Here are some questions.
Why does [2] have an error?
I would appreciate your help.
I look forward to your kind cooperation.
answer.push adds an item to the array and returns a 32-bit integer as its return value.
Array.push
return answer.push(end);
is
var length=answer.push(end);
return length;
Returns the same 32-bit integer value as the .
Therefore, the return value of the function, the number, is
var answer=rangeOfNumber(start, end-1);
Set to answer in
answer.push(end);
If so,
The push function does not exist in the numeric type, so
push is not a function error is displayed.
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