sequency/lib/first.js

Functional sequences for processing iterable data in JavaScript

Object.defineProperty(exports, "__esModule", { value: true });
exports.First = void 0;
var First = /** @class */ (function () {
    function First() {
    }
    /**
     * Returns the first element of the sequence or the first element matching `predicate` if present, otherwise throws
     * an error.
     *
     * @param {(T) => boolean} predicate
     * @returns {T}
     */
    First.prototype.first = function (predicate) {
        if (predicate != null) {
            return this.filter(predicate).first();
        }
        var item = this.iterator.next();
        if (item.done) {
            throw new Error("No such element");
        }
        return item.value;
    };
    return First;
}());
exports.First = First;
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