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# pop

> Return an array containing a read-only truncated view of an input [`ndarray`][@stdlib/ndarray/ctor] and a read-only view of the last element(s) along a specified dimension.

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## Usage

```javascript
var pop = require( '@stdlib/ndarray/pop' );
```

#### pop( x\[, options] )

Returns an array containing a **read-only** truncated view of an input [`ndarray`][@stdlib/ndarray/ctor] and a **read-only** view of the last element(s) along a specified dimension.

```javascript
var array = require( '@stdlib/ndarray/array' );
var ndarray2array = require( '@stdlib/ndarray/to-array' );

var x = array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ], {
    'shape': [ 3, 2 ]
});
// returns <ndarray>

var arr = ndarray2array( x );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]

var y = pop( x );
// returns [ <ndarray>, <ndarray> ]

arr = ndarray2array( y[ 0 ] );
// returns [ [ 1.0 ], [ 3.0 ], [ 5.0 ] ]

arr = ndarray2array( y[ 1 ] );
// returns [ [ 2.0 ], [ 4.0 ], [ 6.0 ] ]
```

The function accepts the following arguments:

-   **x**: input ndarray. Must have one or more dimensions.
-   **options**: function options. (_optional_)

The function supports the following `options`:

-   **dim**: dimension along which to perform the operation. If provided an integer less than zero, the dimension index is resolved relative to the last dimension, with the last dimension corresponding to the value `-1`. Default: `-1`.

By default, the function performs the operation along the last dimension of the input [ndarray][@stdlib/ndarray/ctor]. To perform the operation along a specific dimension, specify the `dim` option.

```javascript
var array = require( '@stdlib/ndarray/array' );
var ndarray2array = require( '@stdlib/ndarray/to-array' );

var x = array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ], {
    'shape': [ 3, 2 ]
});
// returns <ndarray>

var arr = ndarray2array( x );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]

var opts = {
    'dim': 0
};

var y = pop( x, opts );
// returns [ <ndarray>, <ndarray> ]

arr = ndarray2array( y[ 0 ] );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ]

arr = ndarray2array( y[ 1 ] );
// returns [ [ 5.0, 6.0 ] ]
```

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## Examples

<!-- eslint no-undef: "error" -->

```javascript
var array = require( '@stdlib/ndarray/array' );
var ndarray2array = require( '@stdlib/ndarray/to-array' );
var zeroTo = require( '@stdlib/array/zero-to' );
var pop = require( '@stdlib/ndarray/pop' );

// Create an ndarray:
var x = array( zeroTo( 27 ), {
    'shape': [ 3, 3, 3 ]
});
console.log( ndarray2array( x ) );

// Remove the last column from each matrix:
var y = pop( x );

console.log( ndarray2array( y[ 0 ] ) );
console.log( ndarray2array( y[ 1 ] ) );
```

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[@stdlib/ndarray/ctor]: https://github.com/stdlib-js/ndarray/tree/main/ctor

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