how to compare js array values with a string

I have a JSON array and I want to compare its values with a String. For Example, My JSON Array is

{
  "slot": ["10:00 AM", "10:30 AM", "03:30 PM"]
}

Now I am trying to access it in this way:

for (i in data.slot) {
  console.log(slot[i] === "10:00 AM"); //this return false
  if (slot[i] === "10:00 AM") btn1.disabled = true;
  if (slot[i] === "10:30 AM") btn2.disabled = true;
  if (slot[i] === "03:00 PM") btn3.disabled = true;
  if (slot[i] === "03:30 PM") btn4.disabled = true;
}

Now whenever I am trying to compare it, the if statement returns false and the button doesn’t get disabled. I got to know this on the Chrome Dev console. Any Suggestions would be appreciated.

Answer

You need to address the right variable

data.slot[i]
^^^^^

const data = { slot: ["10:00 AM", "10:30 AM", "03:30 PM"] }

for (let i in data.slot) {
  console.log(data.slot[i] === "10:00 AM"); // true false false
  if (data.slot[i] === "10:00 AM")
    btn1.disabled = true;
  if (data.slot[i] === "10:30 AM")
    btn2.disabled = true;
  if (data.slot[i] === "03:00 PM")
    btn3.disabled = true;
  if (data.slot[i] === "03:30 PM")
    btn4.disabled = true;
}

<button id="btn1">1</button>
<button id="btn2">2</button>
<button id="btn3">3</button>
<button id="btn4">4</button>

A better approach takes the value directly by iterating with for ... of statement

const data = { slot: ["10:00 AM", "10:30 AM", "03:30 PM"] }

for (const value of data.slot) {
    console.log(value === "10:00 AM"); // true false false
    if (value === "10:00 AM") btn1.disabled = true;
    if (value === "10:30 AM") btn2.disabled = true;
    if (value === "03:00 PM") btn3.disabled = true;
    if (value === "03:30 PM") btn4.disabled = true;
}

<button id="btn1">1</button>
<button id="btn2">2</button>
<button id="btn3">3</button>
<button id="btn4">4</button>