javascript: how to use javascript array in for loop

Question

I am new to working in js so that my code is not working

my code is:

let output = document.getElementById("output");
let addfruit;
let fruitList = [];
let howManyTimes = prompt("how many fruit to want to add?");
for (let index = 0; index < howManyTimes.length; index++) {
       addfruit = prompt("enter fruits name");
    if (addfruit == "no") {
        break;
    }
  fruitList.push(addfruit);
}
for (myShop of fruitList) {
    output.innerHTML += myShop + "<br/>";
}

my problem is that there is when I want 5 times prompt then I will get only 1 prompt

any help thanks.

Javascript is asynchronous so loop will not wait for prompt to close — Ajith
– Ajith, Commented Jun 30, 2020 at 5:34
@Ajith Agree with you. You can read more about async JS here: developer.mozilla.org/en-US/docs/Learn/JavaScript/Asynchronous — Always Helping
– Always Helping, Commented Jun 30, 2020 at 5:35
@Ajith: That's not true. Of course the loop will wait. If a prompt was async, it wouldn't be very useful. — user12407908
– user12407908, Commented Jun 30, 2020 at 5:53
@AlwaysHelping: Nothing in the code above will run asynchronously; the info in that link won't apply here. — user12407908
– user12407908, Commented Jun 30, 2020 at 5:56

Yousaf · Accepted Answer · 2020-06-30 06:01:55Z

2

howManyTimes is a string, not an array.

You need to convert it to number and then use it in loop condition

let howManyTimes = Number(prompt("how many fruit to want to add?"));

You can also rely on javascript's type coercion to convert howManyTimes to a number. So you can skip explicitly converting howManyTimes to a number.

for (let index = 0; index < howManyTimes; index++) {
    // code
}

edited Jun 30, 2020 at 6:01

answered Jun 30, 2020 at 5:35

Yousaf

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Comments

Always Helping · Accepted Answer · 2020-06-30 05:40:04Z

1

You do not have use .length .length can be used for arrays

Do something like that

Run Snippet to see it work.

let output = document.getElementById("output");
let addfruit;
let fruitList = [];
let howManyTimes = prompt("how many fruit to want to add?");
for (let index = 0; index < howManyTimes; index++) {
  addfruit = prompt("enter fruits name");
  if (addfruit == "no") {
    break;
  }
  fruitList.push(addfruit);
}
for (myShop of fruitList) {
  output.innerHTML += myShop + "<br/>";
}

<div id="output"></div>

answered Jun 30, 2020 at 5:40

Always Helping

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Comments

Paras Prajapati · Accepted Answer · 2020-06-30 05:36:51Z

0

You can be used that.

let output = document.getElementById("output");
let addfruit;
let fruitList = [];
let howManyTimes = prompt("how many fruit to want to add?");
for (let index = 0; index < howManyTimes; index++) {

    addfruit = prompt("enter fruits name");
    if (addfruit == "no") {
        break;
    }
    fruitList.push(addfruit);
}
for (myShop of fruitList) {
    output.innerHTML += myShop + "<br/>";
}

you will run this

answered Jun 30, 2020 at 5:36

Paras Prajapati

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Comments

Santa · Accepted Answer · 2020-06-30 05:42:49Z

0

Just removing '.length' property in the input howManyTimes works,

let output = document.getElementById("output");
let addfruit;
let fruitList = [];
let howManyTimes = prompt("how many fruit to want to add?");
for (let index = 0; index < howManyTimes; index++) {
       addfruit = prompt("enter fruits name");
    if (addfruit == "no") {
        break;
    }
  fruitList.push(addfruit); 
   
}
for (myShop of fruitList) {
    output.innerHTML += myShop + "<br/>";
}

answered Jun 30, 2020 at 5:42

Santa

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