JavaScript：如何将数组forEach，映射，过滤器等转换为“ for”循环？

Question

I wrote a code in valid es5, but some old enterprise system can't eat it as a module, it falls on 'array.forEach'. I don't now why, may be it runs some tests from the 90's or what else.

Is it posible to transpile it via babel or typescript?

// When this...
const a = ['abc', 'defghi'];
const b = a.filter(z => z.length > 3).forEach(z => console.log(z));

// ... becomes something like that
var a = ['abc', 'defghi'];
var b = [];
for (var i = 0; i < a.length; i++) {
    if (a[i].length > 3)  {
        b.push(a[i]);
    }
}

for (var i = 0; i < b.length; i++) {
    console.log(b[i]);
}

Answer 1

You can use Lodash , a library that use methods pretty similar to those ES5 you're trying to use. You can make something _.map([2,3,4], function(item) { console.log(item] })