1834715d.a082b6eb.js

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How set is different from Map",source:"@site/docs/javascript/modules/m13_set_weakset.md",permalink:"/docs/javascript/modules/module13_set_weakset",lastUpdatedBy:"Abhin Pai",lastUpdatedAt:1594401132,sidebar_label:"Module 13: Set and Weakset",sidebar:"docs",previous:{title:"Module",permalink:"/docs/javascript/modules/module11_module"},next:{title:"Map and WeakMap",permalink:"/docs/javascript/modules/module14_map_weakmap"}},s=[{value:"Set",id:"set",children:[{value:"Salient Features of Set",id:"salient-features-of-set",children:[]},{value:"Set methods",id:"set-methods",children:[]},{value:"Set Iteration Methods",id:"set-iteration-methods",children:[]}]},{value:"WeakSet",id:"weakset",children:[]}],c={rightToc:s};function b(e){var t=e.components,a=Object(r.a)(e,["components"]);return Object(i.b)("wrapper",Object(n.a)({},c,a,{components:t,mdxType:"MDXLayout"}),Object(i.b)("div",{className:"admonition admonition-note alert alert--secondary"},Object(i.b)("div",Object(n.a)({parentName:"div"},{className:"admonition-heading"}),Object(i.b)("h5",{parentName:"div"},Object(i.b)("span",Object(n.a)({parentName:"h5"},{className:"admonition-icon"}),Object(i.b)("svg",Object(n.a)({parentName:"span"},{xmlns:"http://www.w3.org/2000/svg",width:"14",height:"16",viewBox:"0 0 14 16"}),Object(i.b)("path",Object(n.a)({parentName:"svg"},{fillRule:"evenodd",d:"M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"})))),"Questions")),Object(i.b)("div",Object(n.a)({parentName:"div"},{className:"admonition-content"}),Object(i.b)("ol",{parentName:"div"},Object(i.b)("li",{parentName:"ol"},"How set is different from Map"),Object(i.b)("li",{parentName:"ol"},"How set is different from Array"),Object(i.b)("li",{parentName:"ol"},"Set vs WeakSet")))),Object(i.b)("h2",{id:"set"},"Set"),Object(i.b)("hr",null),Object(i.b)("p",null,"A set is a special type of collection in Javascript Unless an array set holds only unique values without any ",Object(i.b)("inlineCode",{parentName:"p"},"keys")," where each value occurs only once."),Object(i.b)("h3",{id:"salient-features-of-set"},"Salient Features of Set"),Object(i.b)("h3",{id:"set-methods"},"Set methods"),Object(i.b)("ul",null,Object(i.b)("li",{parentName:"ul"},Object(i.b)("strong",{parentName:"li"},"new Set(iterable)")," \u2013 creates the set, and if an iterable object is provided (usually an array), copies values from it into the set."),Object(i.b)("li",{parentName:"ul"},Object(i.b)("strong",{parentName:"li"},"set.add(value)")," \u2013 adds a value, returns the set itself."),Object(i.b)("li",{parentName:"ul"},Object(i.b)("strong",{parentName:"li"},"set.delete(value)")," \u2013 removes the value, returns true if value existed at the moment of the call, otherwise false."),Object(i.b)("li",{parentName:"ul"},Object(i.b)("strong",{parentName:"li"},"set.has(value)")," \u2013 returns true if the value exists in the set, otherwise false."),Object(i.b)("li",{parentName:"ul"},Object(i.b)("strong",{parentName:"li"},"set.clear()")," \u2013 removes everything from the set."),Object(i.b)("li",{parentName:"ul"},Object(i.b)("strong",{parentName:"li"},"set.size")," \u2013 is the elements count.")),Object(i.b)("h3",{id:"set-iteration-methods"},"Set Iteration Methods"),Object(i.b)("ul",null,Object(i.b)("li",{parentName:"ul"},Object(i.b)("strong",{parentName:"li"},"set.keys()")," \u2013 returns an iterable object for values,"),Object(i.b)("li",{parentName:"ul"},Object(i.b)("strong",{parentName:"li"},"set.values()")," \u2013 same as set.keys(), for compatibility with Map,"),Object(i.b)("li",{parentName:"ul"},Object(i.b)("strong",{parentName:"li"},"set.entries()")," \u2013 returns an iterable object for entries ","[value, value]",", exists for compatibility with Map.")),Object(i.b)("h2",{id:"weakset"},"WeakSet"),Object(i.b)("hr",null),Object(i.b)("p",null,Object(i.b)("inlineCode",{parentName:"p"},"WeakSet")," behave similarly as a ",Object(i.b)("inlineCode",{parentName:"p"},"Set")," but it only allows objects as values, primitive values are not allowed. 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