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comprehensiveSequenceTest('first', {
cases: [
{
input: [1, 2, 3, 4, 5],
params: [3],
result: [1, 2, 3]
}
],
aliases: ['head', 'take']
});
describe("take", function() {
it("doesn't prematurely get the first element when given 0", function() {
expect(Lazy.generate(function (i) {return i;}).take(0).toArray()).toEqual([]);
});
});
describe("takeWhile", function() {
it("exits immediately if the very first element doesn't satisfy the condition", function() {
expect(Lazy([1, 2, 3]).takeWhile(isEven)).toComprise([]);
});
});
comprehensiveSequenceTest('takeWhile', {
cases: [
{
input: [2, 4, 6, 7, 8, 9],
params: [isEven],
result: [2, 4, 6]
}
]
});
describe("initial", function() {
ensureLaziness(function() { Lazy(people).initial(); });
it("selects all but the last element from the collection", function() {
var allButHappy = Lazy(people).initial().toArray();
expect(allButHappy).toEqual([david, mary, lauren, adam, daniel]);
});
it("if N is given, selects all but the last N elements from the collection", function() {
var allButDanAndHappy = Lazy(people).initial(2).toArray();
expect(allButDanAndHappy).toEqual([david, mary, lauren, adam]);
});
it("passes an index along with each element", function() {
expect(Lazy(people).initial(2)).toPassToEach(1, [0, 1, 2, 3]);
});
});
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