pxt-calliope/docs/reference/js/assign.md

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# Assignment Operator
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Set the value for local and global variables.
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### @parent js/operators
Set or change the value of a variable
### Block Editor
![](/static/mb/antenna-0.png)
### Touch Develop
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Use the assignment operator (:=) to set or change the value of a [local variable](/reference/variables/var) or a [global variable](/js/data).
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### Declare a variable
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Declare a new *local* variable using the [var](/reference/variables/var) statement and the assignment operator (`:=`). Like this:
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```blocks
let num1 = 7
let name = "Joe"
```
The variable's name is on the left of the assignment operator (`:=`) and the variable's value is on the right:
*variable name* `:=` *value*
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See [global variable](/js/data) for info on declaring a global variable.
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### Change a variable
After a global or local variable is defined, use the assignment operator (`:=`) to change the variable's value.
```
g = 42
num1 = 42
```
### Notes
* Don't confuse the assignment operator `:=` with the equality operator `=`, which is used to compare values.
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* You can use the assignment operator `:=` with variables of each of the supported [types](/js/types).
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### Lessons
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[counter](/lessons/counter), [rotation animation](/lessons/rotation-animation), [digital pet](/lessons/digital-pet), [offset image](/lessons/offset-image)
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### See also
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[local variables](/reference/variables/var), [global variables](/js/data), [types](/js/types)
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