iterIncrspace

Create an iterator which returns evenly spaced numbers according to a specified increment.

Usage

var iterIncrspace = require( '@stdlib/iter/incrspace' );

iterIncrspace( start, stop[, increment] )

Returns an iterator which returns evenly spaced numbers according to a specified increment.

var it = iterIncrspace( 0, 100 );
// returns <Object>

var v = it.next().value;
// returns 0

v = it.next().value;
// returns 1

v = it.next().value;
// returns 2

// ...

The returned iterator protocol-compliant object has the following properties:

next: function which returns an iterator protocol-compliant object containing the next iterated value (if one exists) assigned to a value property and a done property having a boolean value indicating whether the iterator is finished.
return: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.

By default, the iterator returns values incremented by 1. To adjust value spacing, provide an increment argument.

var it = iterIncrspace( 0, 5, 2 );
// returns <Object>

var v = it.next().value;
// returns 0

v = it.next().value;
// returns 2

v = it.next().value;
// returns 4

var bool = it.next().done;
// returns true

Notes

The returned iterator is guaranteed to return the start value, but does not include the stop value. Beware, however, that values subsequent to the start value are subject to floating-point rounding errors. For example,

var it = iterIncrspace( 0.1, 0.9, 0.2 );
// returns <Object>

var v = it.next().value;
// returns 0.1

v = it.next().value;
// returns ~0.3

v = it.next().value;
// returns 0.5

If you desire more control over value precision, consider using roundn:

var roundn = require( '@stdlib/math/base/special/roundn' );
var iterMap = require( '@stdlib/iter/map' );

function round( v ) {
    return roundn( v, -2 );
}

// Create an iterator returning values subject to floating-point errors:
var it1 = iterIncrspace( 0.1, 1.1, 0.2 );

// Create an iterator to round each value to the nearest hundredth:
var it2 = iterMap( it1, roundn );

// Perform manual iteration...
var v;
while ( true ) {
    v = it2.next();
    if ( v.done ) {
        break;
    }
    console.log( v.value );
}

If an environment supports Symbol.iterator, the returned iterator is iterable.

Examples

var iterIncrspace = require( '@stdlib/iter/incrspace' );

// Create an iterator which is subject to floating-point rounding errors:
var it = iterIncrspace( 0.0, 1.01, 0.02 );

// Perform manual iteration...
var v;
while ( true ) {
    v = it.next();
    if ( v.done ) {
        break;
    }
    console.log( v.value );
}