split a map into two maps in typescript

You can split a map into two maps in TypeScript by using the splice method and the spread operator. Here's a code example:

index.ts
const originalMap = new Map([['key1', 'value1'], ['key2', 'value2'], ['key3', 'value3']]);

// Split the map at index 2
const indexToSplit = 2;
const secondMap = new Map(originalMap.splice(indexToSplit));
const firstMap = new Map(originalMap);

console.log(firstMap); // Outputs: Map { 'key1' => 'value1', 'key2' => 'value2' }
console.log(secondMap); // Outputs: Map { 'key3' => 'value3' }
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In the code above, we first create a Map called originalMap with three key-value pairs. We then specify an indexToSplit variable of 2, which means we want to split the originalMap at the third key-value pair ('key3' => 'value3').

Using the splice method on the originalMap, we splice the map at index 2, which returns the elements that were removed from the map as an array of tuples. We then create a new Map called secondMap from this array using the spread operator.

Finally, we create a firstMap variable by using the remaining items in originalMap after the split.

Running console.log on firstMap shows Map { 'key1' => 'value1', 'key2' => 'value2' }, which contains the key-value pairs from the beginning of the originalMap up until the split. Running console.log on secondMap outputs Map { 'key3' => 'value3' }, which contains the key-value pair that was removed from originalMap during the split.