Function immutable

Returns an IMapImmutable. Use Maps.mutable as a mutable alternatve.

Example: Basic usage

// Creating
let m = map();
// Add
m = m.set("name", "sally");
// Recall
m.get("name");
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Example: Enumerating

for (const [key, value] of map.entries()) {
 console.log(`${key} = ${value}`);
}
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Example: Overview

// Create
let m = map();
// Add as array or key & value pair
m = m.add(["name" , "sally"]);
m = m.add({ key: "name", value: "sally" });
// Add using the more typical set
m = m.set("name", "sally");
m.get("name");   // "sally";
m.has("age");    // false
m.has("name");   // true
m.isEmpty;       // false
m = m.delete("name");
m.entries();     // Iterator of key value pairs
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Since it is immutable, add(), delete() and clear() return a new version with change.