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Versions: 31
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Stored size: 1.44 KB
Contents
require("../env");
require("../../d3");
var vows = require("vows"),
assert = require("assert");
var suite = vows.describe("d3.first");
suite.addBatch({
"first": {
topic: function() {
return d3.first;
},
"compares using natural order by default": function(first) {
assert.strictEqual(first([1, 0]), 0);
assert.strictEqual(first(["1", 0]), 0);
assert.strictEqual(first(["2", "10"]), "10");
assert.strictEqual(first(["2", NaN, "10"]), "10");
assert.strictEqual(first([2, NaN, 10]), 2);
},
"compares using optional comparator": function(first) {
var i = 0, aa, bb, o = new Object();
assert.strictEqual(first([1, o], function(a, b) { aa = a; bb = b; return ++i; }), o);
assert.strictEqual(aa, 1);
assert.strictEqual(bb, o);
assert.strictEqual(first([1, 0], d3.descending), 1);
assert.strictEqual(first(["1", 0], d3.descending), "1");
assert.strictEqual(first(["2", "10"], d3.descending), "2");
assert.strictEqual(first(["2", NaN, "10"], d3.descending), "2");
assert.strictEqual(first([2, NaN, 10], d3.descending), 10);
},
"returns the first of equal values": function(last) {
var a = new Object(), b = new Object(), c = new Object();
assert.strictEqual(last([a, b, c], function() { return 0; }), a);
},
"returns undefined for an empty array": function(first) {
assert.isUndefined(first([]));
}
}
});
suite.export(module);
Version data entries
31 entries across 31 versions & 2 rubygems