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Shrink an array into a group of smaller arrays using underscore.js
// Make sure to include underscore.js
_.mixin({
chunk : function (array, unit) {
if (!_.isArray(array)) return array;
unit = Math.abs(unit);
var results = [],
length = Math.ceil(array.length / unit);
for (var i = 0; i < length; i++) {
results.push(array.slice( i * unit, (i + 1) * unit));
}
return results;
}
}); |
// Make sure to include underscore.js
_.mixin({
chunk : function (array, unit) {
if (!_.isArray(array)) return array;
unit = Math.abs(unit);
var results = [],
length = Math.ceil(array.length / unit);
for (var i = 0; i < length; i++) {
results.push(array.slice( i * unit, (i + 1) * unit));
}
return results;
}
});
Example:
JSON.stringify( _.chunk([1,2,3,4,5,6,7,8,9], 2) );
// returns "[[1,2],[3,4],[5,6],[7,8],[9]]" |
JSON.stringify( _.chunk([1,2,3,4,5,6,7,8,9], 2) );
// returns "[[1,2],[3,4],[5,6],[7,8],[9]]"
Here’s the same thing without using Underscore.js
var chunk = function (array, unit) {
if (typeof array !== "object")
return array;
unit = Math.abs(unit);
var results = [],
length = Math.ceil(array.length / unit);
for (var i = 0; i < length; i++) {
results.push(array.slice(i * unit, (i + 1) * unit));
}
return results;
} |
var chunk = function (array, unit) {
if (typeof array !== "object")
return array;
unit = Math.abs(unit);
var results = [],
length = Math.ceil(array.length / unit);
for (var i = 0; i < length; i++) {
results.push(array.slice(i * unit, (i + 1) * unit));
}
return results;
}
