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<div class="content" data-ice="content"><h1 data-ice="title">spec-js/operators/findIndex-spec.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">"use strict";
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {findIndex} */
describe('Observable.prototype.findIndex', function () {
function truePredicate(x) {
return true;
}
asDiagram('findIndex(x => x % 5 === 0)')('should return matching element from source emits single element', function () {
var values = { a: 3, b: 9, c: 15, d: 20 };
var source = hot('---a--b--c--d---|', values);
var subs = '^ ! ';
var expected = '---------(x|) ';
var predicate = function (x) { return x % 5 === 0; };
expectObservable(source.findIndex(predicate)).toBe(expected, { x: 2 });
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should not emit if source does not emit', function () {
var source = hot('-');
var subs = '^';
var expected = '-';
expectObservable(source.findIndex(truePredicate)).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should return negative index if source is empty to match predicate', function () {
var source = cold('|');
var subs = '(^!)';
var expected = '(x|)';
var result = source.findIndex(truePredicate);
expectObservable(result).toBe(expected, { x: -1 });
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should return index of element from source emits single element', function () {
var sourceValue = 1;
var source = hot('--a--|', { a: sourceValue });
var subs = '^ ! ';
var expected = '--(x|)';
var predicate = function (value) {
return value === sourceValue;
};
expectObservable(source.findIndex(predicate)).toBe(expected, { x: 0 });
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should return index of matching element from source emits multiple elements', function () {
var source = hot('--a--b---c-|', { b: 7 });
var subs = '^ !';
var expected = '-----(x|)';
var predicate = function (value) {
return value === 7;
};
expectObservable(source.findIndex(predicate)).toBe(expected, { x: 1 });
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should work with a custom thisArg', function () {
var sourceValues = { b: 7 };
var source = hot('--a--b---c-|', sourceValues);
var subs = '^ !';
var expected = '-----(x|)';
var predicate = function (value) {
return value === this.b;
};
var result = source.findIndex(predicate, sourceValues);
expectObservable(result).toBe(expected, { x: 1 });
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should return negative index if element does not match with predicate', function () {
var source = hot('--a--b--c--|');
var subs = '^ !';
var expected = '-----------(x|)';
var predicate = function (value) {
return value === 'z';
};
expectObservable(source.findIndex(predicate)).toBe(expected, { x: -1 });
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should allow unsubscribing early and explicitly', function () {
var source = hot('--a--b--c--|');
var subs = '^ ! ';
var expected = '------- ';
var unsub = ' ! ';
var result = source.findIndex(function (value) { return value === 'z'; });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var source = hot('--a--b--c--|');
var subs = '^ ! ';
var expected = '------- ';
var unsub = ' ! ';
var result = source
.mergeMap(function (x) { return Observable.of(x); })
.findIndex(function (value) { return value === 'z'; })
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should raise if source raise error while element does not match with predicate', function () {
var source = hot('--a--b--#');
var subs = '^ !';
var expected = '--------#';
var predicate = function (value) {
return value === 'z';
};
expectObservable(source.findIndex(predicate)).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should raise error if predicate throws error', function () {
var source = hot('--a--b--c--|');
var subs = '^ !';
var expected = '--#';
var predicate = function (value) {
throw 'error';
};
expectObservable(source.findIndex(predicate)).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(subs);
});
});
//# sourceMappingURL=findIndex-spec.js.map</code></pre>
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