JS methods and ops

// array ops
var arr = [];

arr.push();
arr.unshift();

arr.pop(); // stack
arr.shift(); // queue

//https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
arr = arr.concat(arr2); // combine
arr.slice(1);
arr.splice(1,0,item);

arr.join(“‘”);
//

arr.includes() // true
arr.indexOf();

arr.reverse();

arr.sort();
arr.sort(compare);

function compare(a,b) {
    if a.prop < b.prop return -1
    else if b.prop < a.prop return 1
    else return 0
}

function compare(a,b) {
    return a -b
}

var d2m3x = [
    [1,2,3],
    [4,5,6],
    [7,8,9]
];

var d3m3x = [
    [
        [1,2,3],
        [4,5,6],
        [7,8,9]
],
    [
        [1,2,3],
        [4,5,6],
        [7,8,9]
],
    [
        [1,2,3],
        [4,5,6],
        [7,8,9]
]
];

// string ops

slice()
substr()
replace();
replaceAll();
concat();
trim();
indexOf();
charAt();
split();


includes();
startsWith();

toLowerCase()
toUpperCase();

// match ops

+
-
*
/
%
** x**y == Math.pow(x,y)
Math.sqrt(x)
Math.pow(25, 1/2) = 5
Math.pow(n, 1/root)
–
++

toFixed(2); // two decimal places
Number(‘3’); // parse to numb
parseInt();
parseFloat();

Math.round();
Math.ceil();
Math.floor();