Types of Breakpoints
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WebStorm lets you create breakpoints of several types. Each breakpoint type supported by WebStorm addresses different debugging needs and has its own individual settings. Depending on the context, WebStorm distinguishes between the following types of breakpoints:
These breakpoints are assigned to lines of source code and are used to target a particular section for debugging.
Line Breakpoints are triggered when the program reaches the specified line of source code, before it is executed. The line of code that contains a set breakpoint, is marked with a red stripe; once such line of code is reached, the marking stripe changes to blue.
If a file with breakpoints has been modified externally, for example, updated from a version control repository, or changed in an external editor, so that line numbers are changed, then the breakpoints will be moved accordingly. Note that WebStorm should be running at the moment of such modification; otherwise, such changes will pass unnoticed.
Temporary Line Breakpoint
These breakpoints are assigned to lines of source code and are used to target a particular section for debugging. When hit, such breakpoints are immediately removed.
Exception breakpoints are triggered when the specified exception is thrown. Unlike the line breakpoints, which require specific source references, exception breakpoints apply globally to the exception condition, rather than to a particular code reference.