js cheapsheet

sheet.js

function makeArray(w, h, val) {
    var arr = [];
    for(i = 0; i < h; i++) {
        arr[i] = [];
        for(j = 0; j < w; j++) {
            arr[i][j] = val;
        }
    }
    return arr;
}

//split a str by whitespace and ignr lead & tail white space
str.match(/\S+/g) || []


//Max & Min of a Double Array
//arr = [[]]

var max=0;//VERY SMALL VALUE
    
arr.forEach(function(row){
    row.forEach(function(elem){
        max = Math.max(max,elem)
    })
});

//Remove Leading 0 in string

s.replace(/\b0+/g, '')



//SORT
//[ [ 2, 4 ], [ 4, 1 ], [ 8, 8 ], [ 3, 5 ] ]
points = points.sort((pnt, pnt2) => pnt[0] > pnt2[0])
//[ [ 2, 4 ], [ 3, 5 ], [ 4, 1 ], [ 8, 8 ] ]


num.sort((a,b)=>a>b)
//[1, 3, 12]