A JavaScript equivalent of PHP’s array_chunk
function array_chunk (input, size, preserve_keys) {
// http://kevin.vanzonneveld.net
// + original by: Carlos R. L. Rodrigues (http://www.jsfromhell.com)
// + improved by: Brett Zamir (http://brett-zamir.me)
// % note 1: Important note: Per the ECMAScript specification, objects may not always iterate in a predictable order
// * example 1: array_chunk(['Kevin', 'van', 'Zonneveld'], 2);
// * returns 1: [['Kevin', 'van'], ['Zonneveld']]
// * example 2: array_chunk(['Kevin', 'van', 'Zonneveld'], 2, true);
// * returns 2: [{0:'Kevin', 1:'van'}, {2: 'Zonneveld'}]
// * example 3: array_chunk({1:'Kevin', 2:'van', 3:'Zonneveld'}, 2);
// * returns 3: [['Kevin', 'van'], ['Zonneveld']]
// * example 4: array_chunk({1:'Kevin', 2:'van', 3:'Zonneveld'}, 2, true);
// * returns 4: [{1: 'Kevin', 2: 'van'}, {3: 'Zonneveld'}]
var x, p = '', i = 0, c = -1, l = input.length || 0, n = [];
if (size < 1) {
return null;
}
if (Object.prototype.toString.call(input) === '[object Array]') {
if (preserve_keys) {
while (i < l) {
(x = i % size) ? n[c][i] = input[i] : n[++c] = {}, n[c][i] = input[i];
i++;
}
}
else {
while (i < l) {
(x = i % size) ? n[c][x] = input[i] : n[++c] = [input[i]];
i++;
}
}
}
else {
if (preserve_keys) {
for (p in input) {
if (input.hasOwnProperty(p)) {
(x = i % size) ? n[c][p] = input[p] : n[++c] = {}, n[c][p] = input[p];
i++;
}
}
}
else {
for (p in input) {
if (input.hasOwnProperty(p)) {
(x = i % size) ? n[c][x] = input[p] : n[++c] = [input[p]];
i++;
}
}
}
}
return n;
}
example
array_chunk(['Kevin', 'van', 'Zonneveld'], 2);
Should return
returns
[['Kevin', 'van'], ['Zonneveld']]
Example 2
array_chunk(['Kevin', 'van', 'Zonneveld'], 2, true);
Should return
returns
[{0:'Kevin', 1:'van'}, {2: 'Zonneveld'}]
Example 3
array_chunk({1:'Kevin', 2:'van', 3:'Zonneveld'}, 2);
Should return
returns
[['Kevin', 'van'], ['Zonneveld']]