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JavaScript: Difference between revisions
→Data Structures
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==Data Structures== | ==Data Structures== | ||
JavaScript traditionally has arrays and objects (hashmap) data structures.<br> | JavaScript traditionally has arrays and objects (hashmap) data structures.<br> | ||
ES2015 (ES6) adds several collections including: Map, Set, WeakMap, WeakSet | ES2015 (ES6) adds several collections including: Map, Set, WeakMap, WeakSet<br> | ||
[https://www.sitepoint.com/es6-collections-map-set-weakmap-weakset/ ES6 Collections] | |||
===Arrays=== | ===Arrays=== | ||
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let my_map = {}; | let my_map = {}; | ||
my_map["my_key"] = "my_value"; | my_map["my_key"] = "my_value"; | ||
"my_key" in my_map; | |||
// Loop over keys | |||
for (let key in a) { | |||
console.log("Key:", key); | |||
} | |||
</syntaxhighlight> | </syntaxhighlight> | ||
===Map=== | |||
===Set=== | |||
==Modules== | ==Modules== | ||