stdlib-js
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About stdlib...
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accessorSetter
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Return an accessor function for setting an element in an array-like object supporting the get/set protocol.
bash
npm install @stdlib/array-base-accessor-setter
javascript
var accessorSetter = require( '@stdlib/array-base-accessor-setter' );
#### accessorSetter( dtype )
Returns an accessor function for setting an element in an array-like object supporting the get/set protocol.
javascript
var Complex64Array = require( '@stdlib/array-complex64' );
var Complex64 = require( '@stdlib/complex-float32-ctor' );
var realf = require( '@stdlib/complex-float32-real' );
var imagf = require( '@stdlib/complex-float32-imag' );
var arr = new Complex64Array( [ 1, 2, 3, 4 ] );
var set = accessorSetter( 'complex64' );
set( arr, 1, new Complex64( 10.0, 11.0 ) );
var v = arr.get( 1 );
// returns <Complex64>
var re = realf( v );
// returns 10.0
var im = imagf( v );
// returns 11.0
The returned accessor function accepts the following arguments:
- arr: input array.
- idx: element index.
- value: value to set.
dtype][@stdlib/array/dtypes], the function returns a default accessor function for accessing elements from any indexed array-like object supporting the get/set protocol; otherwise, the function returns an accessor function which should only be provided an array instance corresponding to dtype (e.g., if dtype is 'complex64', the returned accessor function should only be provided instances of Complex64Array).
- Accessor functions do not verify that provided input arrays are array instances corresponding to dtype, as doing so would introduce performance overhead. If array instances corresponding to other data types are provided to an accessor function, JavaScript runtimes will consider the function polymorphic, potentially triggering de-optimization. In order to ensure maximum performance, always ensure that an accessor function is monomorphic.
- Accessor functions do not perform bounds checking.
- Accessor functions do not validate input values.
- Accessor functions do not verify that provided input arrays actually implement the get/set protocol.
- An array-like object supporting the get/set protocol is a data structure in which one accesses elements using explicit get and set methods (e.g., Complex64Array and Complex128Array).
javascript
var Complex128Array = require( '@stdlib/array-complex128' );
var Complex64Array = require( '@stdlib/array-complex64' );
var Complex128 = require( '@stdlib/complex-float64-ctor' );
var Complex64 = require( '@stdlib/complex-float32-ctor' );
var zeroTo = require( '@stdlib/array-base-zero-to' );
var dtype = require( '@stdlib/array-dtype' );
var accessorSetter = require( '@stdlib/array-base-accessor-setter' );
var arr = new Complex128Array( zeroTo( 10 ) );
accessorSetter( dtype( arr ) )( arr, 2, new Complex128( 100.0, 101.0 ) );
var v = arr.get( 2 );
// returns <Complex128>
console.log( '%s', v.toString() );
// => '100 + 101i'
arr = new Complex64Array( zeroTo( 10 ) );
accessorSetter( dtype( arr ) )( arr, 4, new Complex64( 102.0, 103.0 ) );
v = arr.get( 4 );
// returns <Complex64>
console.log( '%s', v.toString() );
// => '102 + 103i'
