Convert a 1D array to 2D array
I suppose you could do something like this... Just iterate over the array in chunks.
m1=[1,2,3,4,5,6,7,8,9];
// array = input array
// part = size of the chunk
function splitArray(array, part) {
var tmp = [];
for(var i = 0; i < array.length; i += part) {
tmp.push(array.slice(i, i + part));
}
return tmp;
}
console.log(splitArray(m1, 3)); // [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9 ] ]
Obviously there is no error checking, but you can easily add that.
DEMO
Array.prototype.reshape = function(rows, cols) {
var copy = this.slice(0); // Copy all elements.
this.length = 0; // Clear out existing array.
for (var r = 0; r < rows; r++) {
var row = [];
for (var c = 0; c < cols; c++) {
var i = r * cols + c;
if (i < copy.length) {
row.push(copy[i]);
}
}
this.push(row);
}
};
m1 = [1, 2, 3, 4, 5, 6, 7, 8, 9];
m1.reshape(3, 3); // Reshape array in-place.
console.log(m1);.as-console-wrapper { top:0; max-height:100% !important; }Output:
[
[1, 2, 3],
[4, 5, 6],
[7, 8, 9]
]
JSFiddle DEMO
You can use this code :
const arr = [1,2,3,4,5,6,7,8,9];
const newArr = [];
while(arr.length) newArr.push(arr.splice(0,3));
console.log(newArr);http://jsfiddle.net/JbL3p/