You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
32 lines
847 B
JavaScript
32 lines
847 B
JavaScript
3 years ago
|
"use strict";
|
||
|
|
||
|
const { validateArguments } = require("@validatem/core");
|
||
|
const required = require("@validatem/required");
|
||
|
const ValidationError = require("@validatem/error");
|
||
|
|
||
|
const EndOfStream = require("@promistream/end-of-stream");
|
||
|
const simpleSource = require("@promistream/simple-source");
|
||
|
|
||
|
module.exports = function createStreamFromIterable(iterable) {
|
||
|
validateArguments(arguments, [
|
||
|
[ "iterable", required, (iterable) => {
|
||
|
// FIXME: Move to @validatem/ package
|
||
|
if (!(typeof iterable[Symbol.iterator] === "function")) {
|
||
|
throw new ValidationError("Must be an iterable (eg. an array)");
|
||
|
}
|
||
|
} ]
|
||
|
]);
|
||
|
|
||
|
let iterator = iterable[Symbol.iterator]();
|
||
|
|
||
|
return simpleSource(() => {
|
||
|
let { done, value } = iterator.next();
|
||
|
|
||
|
if (done) {
|
||
|
throw new EndOfStream("End of iterable reached");
|
||
|
} else {
|
||
|
return value;
|
||
|
}
|
||
|
});
|
||
|
};
|