Javascript Uint8Array map()

Introduction

The Javascript Uint8Array map() method maps typed array elements by a provided function.

This method works the same as Array.prototype.map(). 

Uint8Array.map(mapFn[, thisArg])
Parameter
 Optional
 Meaning
mapFn




 Required




 A callback function
Taking three arguments:
currentValue - the current element being processed.
index - Optional, the index of the current element.
array - Optional, the typed array itself.
thisArg
 Optional
 Value to use as this when executing mapFn.

Mapping a typed array to a typed array of square roots 

const numbers = new Uint8Array([1, 4, 9]);
const roots = numbers.map(Math.sqrt);
console.log(numbers);/*from  w  ww  .  java2 s  . c om*/
console.log(roots);

Mapping a typed array of numbers using a function containing an argument 

const numbers = new Uint8Array([1, 4, 9]);
const doubles = numbers.map(function(num) {
  return num * 2;
});/* w  w  w.j  a va 2 s . com*/
console.log(numbers);
console.log(doubles);



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