Sparse arrays vs full arrays (v12)

Revision 12 of this benchmark created on

Setup

var n, N, i, I, sparse = [],
        full = [],
        full2 = [];
    
    N = 16384;
    I = 8;
    
    for (i = 0; i < I; i++) {
      do {
        n = (N * Math.random()) | 0;
        if (n > (N - 1)) {
          n = N - 1;
        }
      } while (sparse[n]);
      sparse[n] = -100 + 200 * Math.random();
    }
    full.length = N;
    full2.length = N;
    for (i = 0; i < N; i++) {
      if (typeof sparse[i] === "number") {
        full[i] = sparse[i];
        full2[i] = sparse[i];
      } else {
        full[i] = 0;
        full2[i] = -100 + 200 * Math.random();
      }
    }

Test runner

Ready to run.

Testing in
TestOps/sec
Sparse array sum
var sum = 0;
sparse.forEach(function(v, i) {
  sum += v;
});
ready
Full array sum
var len = full.length;
sum = 0;
for (i = 0; i < len; i++) {
  sum += full[i];
}
ready
Running sparse on full array
var sum = 0;
full.forEach(function(v, i) {
  sum += v;
});
ready
Sum all elements on a full array without zeros
var len = full2.length;
sum = 0;
for (i = 0; i < len; i++) {
  sum += full2[i];
}
ready
len inside
sum = 0;
for (var i = 0, len =full2.length; i < len; i++) {
  sum += full2[i];
}
ready

Revisions

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