Object has no method 'reduce' error when using arguments in node.js?

Question

Why do I get an error when using `arguments` like this? ``` function sum(){ return arguments.reduce(function(a,b){ console.log(a+b) return a+b; },0); } sum(1,2,3,4); ``` error: ``` /Users/bob/Documents/Code/Node/hello.js:2 return arguments.reduce(function(a,b){ ^ TypeError: Object #

Accepted Answer

`arguments` is not a real array, it's an "array-like" object and `reduce` is not a method of array-like objects. You can use `reduce` by passing `arguments` as context, like this:

```
[].reduce.call(arguments, function(a, b) {

});
```

Edit: more info on array-like objects here at the MDN.

Object has no method 'reduce' error when using arguments in node.js?

Solution

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