Description

This RFC proposes adding the package @stdlib/array/base/cuevery-by-right, which cumulatively tests whether every array element in a provided array passes a test implemented by a predicate function, while iterating from right-to-left. The function should return a new generic array. The package should also provide an #assign API for setting output values in a provided output array.

function isPositive( value ) {
	return ( value > 0 );
}

var x = [ 0, 0, 1, 1, 1 ];

var y1 = cueveryByRight( x, isPositive );
// returns [ true, true, true, false, false ]

var y2 = [ false, null, false, null, false, null, false, null, false, null ];
var out = cueveryByRight.assign( x, y2, 2, 0, isPositive );
// returns [ true, null, true, null, true, null, false, null, false, null ]

var bool = ( out === y2 );
// returns true

where the assign API supports an offset and stride (see, e.g., @stdlib/array/base/take). Note that, by iterating from right to left, the values in the output array are equivalent to having first reversed the input array x and then using left-to-right iteration.

Both APIs should support accessor arrays (see, e.g., @stdlib/array/base/take).

Related Issues

No.

Questions

No.

Other

• See also @stdlib/array/base/every-by-right

Checklist

• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.