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terminal-cv/node_modules/core-js/modules/esnext.iterator.flat-map.js

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1 year ago
'use strict';
// https://github.com/tc39/proposal-iterator-helpers
var $ = require('../internals/export');
var global = require('../internals/global');
var call = require('../internals/function-call');
var aCallable = require('../internals/a-callable');
var anObject = require('../internals/an-object');
var getIteratorMethod = require('../internals/get-iterator-method');
var createIteratorProxy = require('../internals/iterator-create-proxy');
var iteratorClose = require('../internals/iterator-close');
var TypeError = global.TypeError;
var IteratorProxy = createIteratorProxy(function () {
var iterator = this.iterator;
var mapper = this.mapper;
var result, mapped, iteratorMethod, innerIterator;
while (true) {
try {
if (innerIterator = this.innerIterator) {
result = anObject(call(this.innerNext, innerIterator));
if (!result.done) return result.value;
this.innerIterator = this.innerNext = null;
}
result = anObject(call(this.next, iterator));
if (this.done = !!result.done) return;
mapped = mapper(result.value);
iteratorMethod = getIteratorMethod(mapped);
if (!iteratorMethod) {
throw TypeError('.flatMap callback should return an iterable object');
}
this.innerIterator = innerIterator = anObject(call(iteratorMethod, mapped));
this.innerNext = aCallable(innerIterator.next);
} catch (error) {
iteratorClose(iterator, 'throw', error);
}
}
});
$({ target: 'Iterator', proto: true, real: true }, {
flatMap: function flatMap(mapper) {
return new IteratorProxy({
iterator: anObject(this),
mapper: aCallable(mapper),
innerIterator: null,
innerNext: null
});
}
});