Optimizes statements such as `forEach` and `map` to for loops.
npm install babel-plugin-loop-optimizerOptimizes .forEach and .map statements to for stements
``sh`
$ npm install babel-plugin-loop-optimizer
.babelrc
`json`
{
"plugins": ["babel-plugin-loop-optimizer"]
}
`sh`
$ babel --plugins loop-optimizer script.js
`javascript`
require('babel').transform('code', {
plugins: ['loop-optimizer']
});
Now you may say "wait, wait, wait!" This optimizes on things that aren't just arrays! My map#forEach is optimized too! To fix this, add a comment that says // O: KEEP right before the line on which you use the forEach. Examples:
`
var m = new Map();
// O: KEEP
m.forEach(f)
or:
`
var s = new Set();
// O: KEEP
for (var i = 0; i < 5; s.forEach(f)) {
// ...
}
This is required since it is not possible to determine an object's type at compile-time.
`js`
function timesTwo(arr) {
return arr.map(n => n * 2);
}
to:js
function timesTwo(arr) {
var _a = arr;
var _f = n => n * 2;
var _r = [];
for (var _i = 0; _i < _a.length; _i++)
_r.push(_f(_a[_i], _i, _a));
return _r;
}
``
---
If you need any other help, don't hesitate to leave an issue