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# reduce-function-call [](https://travis-ci.org/MoOx/reduce-function-call)
> Reduce function calls in a string, using a callback
---
[Professionally supported reduce-function-call is now available](https://tidelift.com/subscription/pkg/npm-reduce-function-call?utm_source=npm-reduce-function-call&utm_medium=referral&utm_campaign=readme)
---
## Installation
```console
npm install reduce-function-call
```
## Usage
```js
var reduceFunctionCall = require("reduce-function-call")
reduceFunctionCall("foo(1)", "foo", function(body) {
// body === "1"
return parseInt(body, 10) + 1
})
// "2"
var nothingOrUpper = function(body, functionIdentifier) {
// ignore empty value
if (body === "") {
return functionIdentifier + "()"
}
return body.toUpperCase()
}
reduceFunctionCall("bar()", "bar", nothingOrUpper)
// "bar()"
reduceFunctionCall("upper(baz)", "upper", nothingOrUpper)
// "BAZ"
reduceFunctionCall("math(math(2 + 2) * 4 + math(2 + 2)) and other things", "math", function(body, functionIdentifier, call) {
try {
return eval(body)
}
catch (e) {
return call
}
})
// "20 and other things"
reduceFunctionCall("sha bla blah() blaa bla() abla() aabla() blaaa()", /\b([a-z]?bla[a-z]?)\(/, function(body, functionIdentifier) {
if (functionIdentifier === "bla") {
return "ABRACADABRA"
}
return functionIdentifier.replace("bla", "!")
}
// "sha bla !h blaa ABRACADABRA a! aabla() blaaa()"
```
See [unit tests](test/index.js) for others examples.
## Contributing
Work on a branch, install dev-dependencies, respect coding style & run tests before submitting a bug fix or a feature.
```console
git clone https://github.com/MoOx/reduce-function-call.git
git checkout -b patch-1
npm install
npm test
```
---
## [Changelog](CHANGELOG.md)
## [License](LICENSE)
---
## Security contact information
To report a security vulnerability, please use the
[Tidelift security contact](https://tidelift.com/security). Tidelift will
coordinate the fix and disclosure.