Page 84 - JavaScript

console.log(data8[0].toString(16)); // 0x11
console.log(data8[1].toString(16)); // 0x22
console.log(data8[2].toString(16)); // 0x33
console.log(data8[3].toString(16)); // 0x44

Example where Edian type is important

var canvas = document.createElement("canvas");
var ctx = canvas.getContext("2d");
var imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
// To speed up read and write from the image buffer you can create a buffer view that is
// 32 bits allowing you to read/write a pixel in a single operation
var buf32 = new Uint32Array(imgData.data.buffer);
// Mask out Red and Blue channels
var mask = 0x00FF00FF; // bigEndian pixel channels Red,Green,Blue,Alpha
if(isLittleEndian){
mask = 0xFF00FF00; // littleEndian pixel channels Alpha,Blue,Green,Red
}
var len = buf32.length;
var i = 0;
while(i < len){ // Mask all pixels
buf32[i] &= mask; //Mask out Red and Blue
}
ctx.putImageData(imgData);

Getting maximum and minimum

The Math.max() function returns the largest of zero or more numbers.

Math.max(4, 12); // 12
Math.max(-1, -15); // -1

The Math.min() function returns the smallest of zero or more numbers.

Math.min(4, 12); // 4
Math.min(-1, -15); // -15

Getting maximum and minimum from an array:

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9],
max = Math.max.apply(Math, arr),
min = Math.min.apply(Math, arr);

console.log(max); // Logs: 9
console.log(min); // Logs: 1

ECMAScript 6 spread operator, getting the maximum and minimum of an array:

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9],
max = Math.max(...arr),
min = Math.min(...arr);

console.log(max); // Logs: 9

https://riptutorial.com/ 41