JavaScript, JSON ：我如何运行一个 for 循环特定的时间？

Question

我有这段代码 - 它有点棘手：

let i = 0;
const inputBuffer = [];

const randomnumber = (min, max) => {
    return Math.floor(Math.random() * (max - min + 1) + min);
}

for (let k = 0; k < 10; k++) {
    console.log(convert(randomnumber(0, 1982)));
}

function convert(input) {
    inputBuffer.push(input);
    const output = {"current" : "0"};
    
    if (i % 3 == 0) {
        let sum = 0;
        for (let ii = 0; ii < i; ii++) {
            sum += inputBuffer[ii];
        }
        output.sum = sum;
    }
    i++;
    output.current = input;
   
    return JSON.stringify(output);
}

输出如下所示：

{"current":605,"sum":0}
{"current":708}
{"current":456}
{"current":1838,"sum":1769}
{"current":1619}
{"current":1404}
{"current":1068,"sum":6630}
{"current":1178}
{"current":989}
{"current":1280,"sum":9865}

但我希望它看起来像这样：

{"current": 605}
{"current": 708}
{"current": 456}
{"current": 1838,"sum":1769}
{"current": 1619}
{"current": 1404}
{"current": 1068,"sum":6630}
{"current": 1178}
{"current": 989}
{"current": 1280,"sum":9865}

let i = 0;
const inputBuffer = [];

const randomnumber = (min, max) => {
  return Math.floor(Math.random() * (max - min + 1) + min);

}
for (let k = 0; k < 10; k++) {
  console.log(convert(randomnumber(0, 1982)));
}

function convert(input) {
  inputBuffer.push(input);
  const output = {
    "current": "0"
  };
  if (i % 3 == 0) {
    let sum = 0;
    for (let ii = 0; ii < i; ii++) {
      sum += inputBuffer[ii];
    }
    output.sum = sum;
  }
  i++;
  output.current = input;

  return JSON.stringify(output);
}

我不想第一次显示总和，但以后每 3 次显示一次

有什么想法吗？ :D

PS。我更喜欢保持基本状态，只使用 for 循环

晚上好

Answer 1

你给output.sum赋值的时候可以检查一下i是否不为零吗？

类似于以下内容：

let i = 0;
const inputBuffer = [];

const randomnumber = (min, max) => {
    return Math.floor(Math.random() * (max - min + 1) + min);

}
for (let k = 0; k < 10; k++) {
    console.log(convert(randomnumber(0, 1982)));
}

function convert(input) {
    inputBuffer.push(input);
    const output = {"current" : "0"};
    
    
    if (i % 3 == 0) {
        let sum = 0;
        for (let ii = 0; ii < i; ii++) {
            sum += inputBuffer[ii];
        }
        if (i !== 0) output.sum = sum; // HERE
    }
    i++;
    output.current = input;
   
    return JSON.stringify(output);
}

Answer 2

我发现了这一点，你的显然更短，但这是我的想法 :D

let i = 0;
const inputBuffer = [];
let db = false;
const randomnumber = (min, max) => {
    return Math.floor(Math.random() * (max - min + 1) + min);

}
for (let k = 0; k < 10; k++) {
    console.log(convert(randomnumber(0, 1982)));
}

function convert(input) {
    inputBuffer.push(input);
    
    const output = {"current" : "0"};
    

    if (db && i % 3 == 0) {
        let sum = 0;
        for (let ii = 0; ii < i; ii++) {
            sum += inputBuffer[ii];
        }
        output.sum = sum;
    }
    i++
    db = true;
    
    output.current = input;
   
    return JSON.stringify(output);
}

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