Javascript BigInt64Array from()

Introduction

The BigInt64Array.from() method creates a new typed array from an array-like or iterable object.

This method works the same as Array.from(). 

BigInt64Array.from(source[, mapFn[, thisArg]])
Parameter Optional Meaning
sourceRequired An array-like or iterable object to convert to a typed array.
mapFn Optional Map function to call on every element of the typed array.
thisArgOptional Value to use as this when executing mapFn.
// Set (iterable object)
const s = new Set([1n, 2n, 3n]);// ww  w.j  a va 2  s  . co  m
let a = BigInt64Array.from(s);
console.log(a);

//String
a = BigInt64Array.from('123');
console.log(a);

// Using an arrow function as the map function to manipulate the elements
a = BigInt64Array.from([1n, 2n, 3n], x => x + x);
console.log(a);

// Generate a sequence of numbers
a = BigInt64Array.from({length: 5}, (v, k) => k);
console.log(a);



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