var arr = [1,2,3,4,5,6,7,8,9,10]; var result = []; for(i=0; i<arr.length; i+=3) result.push(arr.slice(i, i+3)); console.log(result)
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[[1, 2, 3], [4, 5, 6], [7, 8, 9], [10]]
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