> For the complete documentation index, see [llms.txt](https://docs.intrepidcs.com/vspy-3-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.intrepidcs.com/vspy-3-documentation/3.9.15/vehicle-spy-main-menus/main-menu-scripting-and-automation/function-blocks/function-blocks-types/script-type-function-block-commands/script-type-function-block-command-jump-if.md).

# Script Type Function Block Command: Jump If

### Command Description

This command evaluates a supplied expression, and if it is **True**, immediately directs Vehicle Spy to continue the script at the step number provided.

**Jump If** differs from **Jump To** in that the jump only occurs if the expression is **True**. It can be used to conditionally control the flow of execution of a function block script, such as skipping certain commands based on a signal value.

Note that excessive use of **Jump If** and **Jump To** commands can make a script difficult to understand. In many cases, an [If / Else / Else If / End If](/vspy-3-documentation/3.9.15/vehicle-spy-main-menus/main-menu-scripting-and-automation/function-blocks/function-blocks-types/script-type-function-block-commands/script-type-function-block-commands-if-else-else-if-end-if.md) structure can accomplish the same task with code that is easier to understand.

### Value Field Parameters

Double-clicking the **Value** field brings up a dialog box (Figure 1) to set two command parameters: the expression to evaluate, and the step to branch to if the expression is **True**.

![Figure 1: Setting the expression to evaluate and destination step number for the Jump If command..](https://2396693198-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FlRJv2XDCMeZSU0VbeZlG%2Fuploads%2Fgit-blob-f9e8430ddcad1839c5ddd2b29e1f11dd588d563d%2Ffb_jump_if.gif?alt=media)


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