untouched
Get pristine copies of built-in objects (like Array or JSON), even if they've been modified. This is generally for library authors who find themselves in monkey-patched browser environments.
Currently only made for browsers. Feel free to submit a Node patch with the vm module!
To use with Browserify or Webpack:
var untouched = require('untouched')
var myUntouched = untouched()
var untouchedJson = myUntouched('json')You can also include the script tag on the page (grab it from src/untouched.js):
<script src="untouched.js"></script>
<script>
var myUntouched = untouched()
var untouchedJson = myUntouched('json')
</script>Here's an example:
// Let's say that someone has messed with the Array prototype.
// If you try to use it, you're screwed!
Array.prototype.map = function () {
return 'this no longer works'
}
// This will return 'this no longer works'!
var arr = [1, 2, 3]
arr.map(function (n) {
return n * n
})
// With untouched, you can get around this problem.
// This returns what you expect!
var myUntouched = untouched()
var untouchedArr = new myUntouched('Array')(1, 2, 3)
untouchedArr.map(function (n) {
return * n
})
// You can use it for things other than Array, too.
var untouchedJson = myUntouched('JSON')
untouchedJson.stringify({ hi: 5 })We accomplish this by creating a hidden <iframe> and pulling variables out of it. You can remove the iframe whenever you're done with it:
myUntouched.destroy()
