javascript after import variable Cannot access before initialization

Question

why I can log the imported variable but it show undefined when I added to another variable.

index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script type="module" src="index.js"></script>
</body>
</html>

index.js

import log from './log.js';
export var test = 'Hello';
log();

log.js

import { test } from './index.js';
var x = test + '  Word'
export default function log() {
    console.log(test);
    console.log(x);
}

console log

Hello
undefined  Word

Nick · Accepted Answer · 2020-06-09 12:41:04Z

1

In log.js you need to initialize var "x" in the function. This will work, I tested.

import { test } from './index.js';
export default function log() {
  var x = test + '  Word'
  console.log(test);
  console.log(x);
}

edited Jun 9, 2020 at 12:41

answered Jun 9, 2020 at 12:35

Nick

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