Javascript Float64Array from()

Introduction

The Float64Array.from() method creates a new typed array from an array-like or iterable object.

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

Float64Array.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([1, 2, 3]);//from  w  w  w. j ava 2  s . c  o m
let a = Float64Array.from(s);
console.log(a);

//String
a = Float64Array.from('123');
console.log(a);

// Using an arrow function as the map function to manipulate the elements
a = Float32Array.from([1, 2, 3], x => x + x);
console.log(a);

// Generate a sequence of numbers
a = Float64Array.from({length: 5}, (v, k) => k);
console.log(a);



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