Run results for: Double Lookup

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Linux

Device Platform: Desktop

Date tested: 3 months ago

Test name	Executions per second
Double-Get	104487.6 Ops/sec
Key Check (Own)	169578.9 Ops/sec
Key Check (General)	172283.9 Ops/sec

Script Preparation code:

var x = {a: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, b: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, c: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, d: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, e: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, f: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, g: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, h: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, i: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, j: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, k: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, l: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, m: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, n: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, o: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, p: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, q: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, r: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, s: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, t: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}, u: {a: 0, b: 1, c: 2, d: 3, e: 4, f: 5, g: 6, h: 7, i: 8, j: 9, k: 10, l: 11, m: 12, n: 13, o: 14, p: 15, q: 16, r: 17, s: 18, t: 19, u: 20}};
var y = [
  "a", "_b", "c", "_d", "e", "_f", "g", "_h", "i", "_j", "k", "_l", "m",
  "n", "_o", "p", "_q", "r", "_s", "t", "_u", "v", "_w", "x", "_y", "z"
];
    
x.zz = 0;
delete x.zz;

Tests:

Double-Get
for (var i = 0; i < y.length; ++i) { var v = null; var k = y[i]; if (x[k] !== undefined) { v = x[k]; } }
Key Check (Own)
for (var i = 0; i < y.length; ++i) { var v = null; var k = y[i]; if (x.hasOwnProperty(k)) { v = x[k]; } }
Key Check (General)
for (var i = 0; i < y.length; ++i) { var v = null; var k = y[i]; if (k in x) { v = x[k]; } }

Run results for: Double Lookup

http://jsperf.com/double-lookup/

Double-Get

Key Check (Own)

Key Check (General)