/
set-helpers.js
61 lines (51 loc) · 1.24 KB
/
set-helpers.js
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var getBuiltIn = require('../internals/get-built-in');
var anObject = require('../internals/an-object');
var tryToString = require('../internals/try-to-string');
var iterateSimple = require('../internals/iterate-simple');
var Set = getBuiltIn('Set');
var SetPrototype = Set.prototype;
var $TypeError = TypeError;
var aSet = function (it) {
anObject(it);
if ('size' in it && 'has' in it && 'add' in it && 'delete' in it && 'keys' in it) return it;
throw $TypeError(tryToString(it) + ' is not a set');
};
var add = function (set, it) {
return set.add(it);
};
var remove = function (set, it) {
return set['delete'](it);
};
var forEach = function (set, fn) {
set.forEach(fn);
};
var has = function (set, it) {
return set.has(it);
};
var size = function (set) {
return set.size;
};
var clone = function (set) {
var result = new Set();
forEach(set, function (it) {
add(result, it);
});
return result;
};
var iterate = function (set, fn) {
var iterator = set.keys();
return iterateSimple(iterator, fn, iterator.next);
};
module.exports = {
Set: Set,
aSet: aSet,
add: add,
remove: remove,
forEach: forEach,
has: has,
size: size,
clone: clone,
iterate: iterate,
$has: SetPrototype.has,
$keys: SetPrototype.keys
};