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Create an iterator which returns evenly spaced numbers according to a specified increment.
To use in Observable,
iterIncrspace = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/iter-incrspace@umd/browser.js' )
To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var iterIncrspace = require( 'path/to/vendor/umd/iter-incrspace/index.js' )
To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/iter-incrspace@umd/browser.js"></script>
If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.iterIncrspace;
})();
</script>
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 adone
property having aboolean
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
-
The returned iterator is guaranteed to return the
start
value, but does not include thestop
value. Beware, however, that values subsequent to thestart
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.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/iter-incrspace@umd/browser.js"></script>
<script type="text/javascript">
(function () {
// 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 );
}
})();
</script>
</body>
</html>
@stdlib/array-from-iterator
: create (or fill) an array from an iterator.@stdlib/iter-datespace
: create an iterator which returns evenly spaced dates over a specified interval.@stdlib/iter-linspace
: create an iterator which returns evenly spaced numbers over a specified interval.@stdlib/iter-logspace
: create an iterator which returns evenly spaced numbers on a log scale.@stdlib/iter-step
: create an iterator which returns a sequence of numbers according to a specified increment.@stdlib/iter-unitspace
: create an iterator which returns numbers incremented by one.
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
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