为什么结果数组以 0 而不是 1 开头？

Question

Shouldn't i be pushing 1 to my result array for the first iteration if start = 0?

function getEveryOtherNumber(start, end) {
    let resultArr = [];
    while (start < end) {
        resultArr.push(start++);
        start++;
    }
    return resultArr;
}

console.log(getEveryOtherNumber(0, 10)); // =>  [ 0, 2, 4, 6, 8 ] 

Answer 1

start++ the postfix operator returns the value of start and then increments.

++start the prefix operator increments the value of start and then returns.

You are looking for the second one:)

Answer 2

because start starts at 0, and start++ assigns the value AFTER pushing.

if you want to do it before, use ++start .