评估ES6数组理解字符串

Question

In ES6, I can use

[for(i1 of [0, 1]) for(i2 of [0, 1]) [i1, i2]]

and get

[[0, 0], [1, 0], [0, 1], [1, 1]]

I can build a string like

str = '[for(i0 of [0, 1]) for(i1 of [0, 1]) [i0, i1]]'

or

str = '[for(i1 of [0, 1]) for(i2 of [0, 1]) for(i3 of [0, 1]) [i1, i2, i3]]'.

How to evaluate/excute such a string?

Answer 1

You can do the same thing as you would do in ECMAScript 5. Using either eval :

var arr = eval(str);

or new Function :

var arr = new Function('return' + str)();

Answer 2

Use System.module or System.define .

From http://www.2ality.com/2014/09/es6-modules-final.html :

• System.module(source, options?) evaluates the JavaScript code in source to a module (which is delivered asynchronously via a promise).

• System.set(name, module) is for registering a module (eg one you have created via System.module()).

• System.define(name, source, options?) both evaluates the module code in source and registers the result.