Set
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015. * Some parts of this feature may have varying levels of support. Learn more See full compatibility Report feedback Description Set objects are collections of values. A value in the set may only occur once; it is unique in the set's collection. You can iterate
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処理を実行中です
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New in JavaScript 1.7 - Archive of obsolete content | MDN
