如何让循环读取数字数组并找到最大值？

Question

我知道一个循环会重复指定的次数，但是我怎么做才能让它读取整个数组并返回某个值呢？我试图返回两个测试题的最大值，但我得到的唯一结果是数组的第一个值。

function question1(numberArray) {
  for (let i = 0; i < numberArray.length; i = i + 1) {
    number = numberArray[i];
    return number;
  }
}

function testQuestion1() {
  let testArray = [10, 45, 33, 67, 433, 33];
  let answer1 = question1(testArray);
  if(question1(testArray) == 433) {
    console.log("Question 1:Found the largest");
  } else {
    console.log("Question1: For array ", testArray, " returned ", answer1, "Which is not the largest");
  }

  let testArray2 = [10, -900, 3000, 22, 33, 67, 433, 33];
  let answer2 = question1(testArray);
  if(question1(testArray2) == 3000) {
    console.log("Question 1: Found the largest");
  } else {
    console.log("Question 1: For array ", testArray2, " returned ", answer2, "Which is not the largest");
  }
}

Answer 1

将Math.max与数组扩展运算符一起使用(也在链接中)：

function myMax(numberArray) {
  return Math.max(...numberArray);
}

使用for循环和max变量：

function myMax(numberArray) {
  var max=-Infinity;
  for(var i=0; i<numberArray.length; i++)
    if(numberArray[i]>max)
      max=numberArray[i];
  return max;
}

使用reduce

function myMax(numberArray) {
  return numberArray.reduce((max, arrayItem)=>Math.max(max, arrayItem),-Infinity);
}

所有情况下，如果numberArray为空，则返回-Infinity。