lossless-cut/expressions.md

# Expressions

LosslessCut has support for JavaScript expressions in certain dialogs. This is a base JavaScript environment with [core JavaScript functionality](https://developer.mozilla.org/en-US/docs/Web/JavaScript) available for you to use.

## Select segments by expression

You will be given a variable `segment` and can create an expression that returns `true` or `false`. For example to select all segments with a duration of less than 5 seconds use this expression:

```js
segment.duration < 5
```

## Edit segments by expression

LosslessCut has support for normal JavaScript expressions. You will be given a variable `segment` for each selected segment and can return a new segment with modified properties.

See more examples in-app.

## Output name template

You can also use JavaScript expressions when referring to variables inside `${}` in output file name templates, e.g. `${FILENAME.toLowerCase()}`.
use js expressions instead of mathjs #2002 2 years ago			`# Expressions`

Introduce template variable `FILES` ...for all templates. It is a list of SourceFile objects. ```ts interface SourceFile { name: string, // The file's name without the file system path path: string, // The full filesystem path of the file size?: number \| bigint, // File size in bytes // All times are expressed in milliseconds since the POSIX Epoch: atime?: number, // The timestamp indicating the last time this file was accessed. mtime?: number, // The timestamp indicating the last time this file was modified. ctime?: number, // The timestamp indicating the last time the file status was changed. birthtime?: number, // The timestamp indicating the creation time of this file. } ``` closes #2694 also refactor a bit 6 months ago			`LosslessCut has support for JavaScript expressions in certain dialogs. This is a base JavaScript environment with [core JavaScript functionality](https://developer.mozilla.org/en-US/docs/Web/JavaScript) available for you to use.`
allow editing segments by js expression closes #2128 #2305 1 year ago
use js expressions instead of mathjs #2002 2 years ago			`## Select segments by expression`

allow editing segments by js expression closes #2128 #2305 1 year ago			You will be given a variable `segment` and can create an expression that returns `true` or `false`. For example to select all segments with a duration of less than 5 seconds use this expression:
use js expressions instead of mathjs #2002 2 years ago
			```js
			`segment.duration < 5`
			```

allow editing segments by js expression closes #2128 #2305 1 year ago			`## Edit segments by expression`

			LosslessCut has support for normal JavaScript expressions. You will be given a variable `segment` for each selected segment and can return a new segment with modified properties.

			`See more examples in-app.`
document js expr 6 months ago
			`## Output name template`

			You can also use JavaScript expressions when referring to variables inside `${}` in output file name templates, e.g. `${FILENAME.toLowerCase()}`.