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Create an iterator which replicates each iterated value according to a provided function.
To use in Observable,
iterReplicateBy = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/iter-replicate-by@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var iterReplicateBy = require( 'path/to/vendor/umd/iter-replicate-by/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/iter-replicate-by@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.iterReplicateBy;
})();
</script>Returns an iterator which replicates each iterated value according to a provided function.
var array2iterator = require( '@stdlib/array-to-iterator' );
function fcn( v, i ) {
return i + 1;
}
var it = iterReplicateBy( array2iterator( [ 1, 2, 3, 4 ] ), fcn );
// returns <Object>
var v = it.next().value;
// returns 1
v = it.next().value;
// returns 2
v = it.next().value;
// returns 2
v = it.next().value;
// returns 3
v = it.next().value;
// returns 3
v = it.next().value;
// returns 3
v = it.next().value;
// returns 4
// ...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
valueproperty and adoneproperty having abooleanvalue indicating whether the iterator is finished. - return: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.
The callback function is provided three arguments:
- value: iterated value
- index: source iteration index (zero-based)
- n: iteration index (zero-based)
To set the callback execution context, provide a thisArg.
var array2iterator = require( '@stdlib/array-to-iterator' );
function fcn( v, i ) {
this.count += 1;
return i + 1;
}
var ctx = {
'count': 0
};
var it = iterReplicateBy( array2iterator( [ 1, 2, 3, 4 ] ), fcn, ctx );
// returns <Object>
var v = it.next().value;
// returns 1
v = it.next().value;
// returns 2
v = it.next().value;
// returns 2
v = it.next().value;
// returns 3
var count = ctx.count;
// returns 3- A callback function is invoked once per iterated value of the provided
iterator. - A callback function must return an integer value. If the return value is less than or equal to
0, the returned iterator skips an iterated value and invokes the callback for the next iterated value of the providediterator. - If an environment supports
Symbol.iteratorand a provided iterator is iterable, the returned iterator is iterable.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/random-iter-randu@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/random-base-discrete-uniform@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/iter-replicate-by@umd/browser.js"></script>
<script type="text/javascript">
(function () {
// Create a seeded iterator for generating pseudorandom numbers:
var rand = randu({
'seed': 1234,
'iter': 10
});
// Create an iterator which replicates each generated number a random number of times:
var it = iterReplicateBy( rand, discreteUniform.factory( 1, 10 ) );
// Perform manual iteration...
var v;
while ( true ) {
v = it.next();
if ( v.done ) {
break;
}
console.log( v.value );
}
})();
</script>
</body>
</html>@stdlib/iter-replicate: create an iterator which replicates each iterated value a specified number of times.
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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