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# Function forEach
Iterate over all elements of a matrix/array, and executes the given callback function.
## Syntax
```js
math.forEach(x, callback)
```
### Parameters
Parameter | Type | Description
--------- | ---- | -----------
`x` | Matrix | Array | The matrix to iterate on.
`callback` | Function | The callback function is invoked with three parameters: the value of the element, the index of the element, and the Matrix/array being traversed.
## Examples
```js
math.forEach([1, 2, 3], function(value) {
console.log(value);
});
// outputs 1, 2, 3
```
## See also
[filter](filter.md),
[map](map.md),
[sort](sort.md)