loggersoft.kotlin.utils.Collection.kt Maven / Gradle / Ivy

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Helpful extra utils for the kotlin-std library.

There is a newer version: 0.77

/*
 * Copyright (C) 2018 Alexander Kornilov ([email protected])
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package loggersoft.kotlin.utils

/**
 * Returns a single item of the [Collection] or `null` if collection [Collection.size] is not equal one.
 */
fun  Collection.oneOrNull(): T? = if (size == 1) first() else null