87 lines
1.5 KiB
Markdown
87 lines
1.5 KiB
Markdown
---
|
|
id: 5ee127a03c3b35dd45426493
|
|
title: Assigning the Value of One Variable to Another
|
|
challengeType: 1
|
|
videoUrl: ''
|
|
forumTopicId: 418265
|
|
dashedName: assigning-the-value-of-one-variable-to-another
|
|
---
|
|
|
|
# --description--
|
|
|
|
After a value is assigned to a variable using the <dfn>assignment</dfn> operator, you can assign the value of that variable to another variable using the <dfn>assignment</dfn> operator.
|
|
|
|
```js
|
|
var myVar;
|
|
myVar = 5;
|
|
var myNum;
|
|
myNum = myVar;
|
|
```
|
|
|
|
The above declares a `myVar` variable with no value, then assigns it the value `5`. Next, a variable named `myNum` is declared with no value. Then, the contents of `myVar` (which is `5`) is assigned to the variable `myNum`. Now, `myNum` also has the value of `5`.
|
|
|
|
# --instructions--
|
|
|
|
Assign the contents of `a` to variable `b`.
|
|
|
|
# --hints--
|
|
|
|
You should not change code above the specified comment.
|
|
|
|
```js
|
|
assert(/var a;/.test(code) && /a = 7;/.test(code) && /var b;/.test(code));
|
|
```
|
|
|
|
`b` should have a value of `7`.
|
|
|
|
```js
|
|
assert(typeof b === 'number' && b === 7);
|
|
```
|
|
|
|
`a` should be assigned to `b` with `=`.
|
|
|
|
```js
|
|
assert(/b\s*=\s*a\s*/g.test(code));
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --before-user-code--
|
|
|
|
```js
|
|
if (typeof a != 'undefined') {
|
|
a = undefined;
|
|
}
|
|
if (typeof b != 'undefined') {
|
|
b = undefined;
|
|
}
|
|
```
|
|
|
|
## --after-user-code--
|
|
|
|
```js
|
|
(function(a, b) {
|
|
return 'a = ' + a + ', b = ' + b;
|
|
})(a, b);
|
|
```
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
// Setup
|
|
var a;
|
|
a = 7;
|
|
var b;
|
|
|
|
// Only change code below this line
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
var a;
|
|
a = 7;
|
|
var b;
|
|
b = a;
|
|
```
|