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JavaScript: Difference between revisions
→Map
(→Usage) |
(→Map) |
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===Map=== | ===Map=== | ||
[https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map Reference] | |||
<syntaxhighlight lang="js"> | |||
let myMap = new Map(); | |||
let keyObj = {}; | |||
// Set value | |||
myMap.set(keyObj, 'value associated with keyObj'); | |||
// Get size | |||
myMap.size; | |||
// Get value | |||
myMap.get(keyObj); | |||
// Check if key is in the map | |||
myMap.has(keyObj); | |||
// Delete | |||
myMap.delete(keyObj); | |||
</syntaxhighlight> | |||
;Notes | |||
* You can mix and match types of keys | |||
* The hash for objects are randomly generated under the hood | |||
* Do not use <code>[]</code> to get or set from the map | |||
===Set=== | ===Set=== | ||