Node.js 函数参数注入函数

Question

I'm tring to create new function like below

function NVConvertToFV (array, func) {
    var funcA = [];
    for(var i=0; i<array.length; i++) {
        var valueF = function (callback) {
            func(array[i], callback);
        }
        funcA[i] = valueF;
    }
    return funcA;
}

But, 'func(array[i], callback);' recognized as just a string.

ex.

var funcA = [];
var msg = ['hello ', 'it ', 'is ', 'impossible!'];
function alert (para, callback) {
    console.log(para);
    callback(null);
}
funcA = NVConvertToFV(msg, alert);
console.log(String(funcA));

results:

function (callback) {func(array[i], callback);},
function (callback) {func(array[i], callback);},
function (callback) {func(array[i], callback);},
function (callback) {func(array[i], callback);},

Is there any possible way 'func' and 'array[i]' recognized as function and array? like,

function (callback) {alert('hello', callback);},
function (callback) {alert('it', callback);},
function (callback) {alert('is', callback);},
function (callback) {alert('impossible', callback);},

if someone help me that would be really gladful.

Answer 1

In NVConvertToFV() use array.forEach() instead of a normal for-loop in order to correctly capture the current value in the array so that the inner inline callback holds the correct reference. For example:

function NVConvertToFV(array, func) {
  var funcA = new Array(array.length);
  array.forEach(function(val, i) {
    funcA[i] = function(callback) {
      func(val, callback);
    };
  });
  return funcA;
}