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81 lines
1.4 KiB
Markdown
81 lines
1.4 KiB
Markdown
---
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id: cf1111c1c11feddfaeb8bdef
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title: Modify Array Data With Indexes
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challengeType: 1
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forumTopicId: 18241
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dashedName: modify-array-data-with-indexes
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---
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# --description--
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Unlike strings, the entries of arrays are <dfn>mutable</dfn> and can be changed freely, even if the array was declared with `const`.
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**Example**
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```js
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const ourArray = [50, 40, 30];
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ourArray[0] = 15;
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```
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`ourArray` now has the value `[15, 40, 30]`.
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**Note:** There shouldn't be any spaces between the array name and the square brackets, like `array [0]`. Although JavaScript is able to process this correctly, this may confuse other programmers reading your code.
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# --instructions--
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Modify the data stored at index `0` of `myArray` to a value of `45`.
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# --hints--
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`myArray` should now be `[45, 64, 99]`.
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```js
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assert(
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(function () {
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if (
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typeof myArray != 'undefined' &&
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myArray[0] == 45 &&
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myArray[1] == 64 &&
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myArray[2] == 99
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) {
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return true;
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} else {
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return false;
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}
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})()
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);
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```
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You should be using correct index to modify the value in `myArray`.
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```js
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assert(
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(function () {
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if (__helpers.removeJSComments(code).match(/myArray\[0\]\s*=\s*/g)) {
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return true;
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} else {
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return false;
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}
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})()
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);
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```
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# --seed--
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## --seed-contents--
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```js
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// Setup
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const myArray = [18, 64, 99];
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// Only change code below this line
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```
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# --solutions--
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```js
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const myArray = [18, 64, 99];
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myArray[0] = 45;
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```
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