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Contents
/**
* Returns the only element of an observable sequence that matches the predicate, or a default value if no such element exists; this method reports an exception if there is more than one element in the observable sequence.
* @example
* var res = res = source.singleOrDefault();
* var res = res = source.singleOrDefault(function (x) { return x === 42; });
* res = source.singleOrDefault(function (x) { return x === 42; }, 0);
* res = source.singleOrDefault(null, 0);
* @memberOf Observable#
* @param {Function} predicate A predicate function to evaluate for elements in the source sequence.
* @param [defaultValue] The default value if the index is outside the bounds of the source sequence.
* @param {Any} [thisArg] Object to use as `this` when executing the predicate.
* @returns {Observable} Sequence containing the single element in the observable sequence that satisfies the condition in the predicate, or a default value if no such element exists.
*/
observableProto.singleOrDefault = function (predicate, defaultValue, thisArg) {
return predicate && isFunction(predicate) ?
this.filter(predicate, thisArg).singleOrDefault(null, defaultValue) :
singleOrDefaultAsync(this, true, defaultValue);
};
Version data entries
14 entries across 7 versions & 1 rubygems