As of 1.3, Kotlin comes with its own multi-platform Random generator. Groups values returned by the valueTransform function applied to each element of the original collection by the key returned by the given keySelector function applied to the element and returns a map where each group key is associated with a list of corresponding values. and its index in the original collection. In this post, we will learn different Kotlin string methods to remove the first and last characters of a string. Returns a list containing all elements of the original collection and then the given element. sliding along this collection with the given step. Returns the single element, or throws an exception if the collection is empty or has more than one element. So am I. Java is a registered trademark of Oracle and/or its affiliates. Returns first index of element, or -1 if the collection does not contain element. provided by transform function applied to each element of the given collection. The first element is first, subsequent elements are the previous element plus a step. Returns a list of all elements sorted according to their natural sort order. Returns an original collection containing all the non-null elements, throwing an IllegalArgumentException if there are any null elements. Returns a list containing all elements except first n elements. Returns a list of all elements sorted according to natural sort order of the value returned by specified selector function. Returns an element at the given index or null if the index is out of bounds of this collection. var arr = Array(size) {0} // it will create an integer array var arr = Array (size) {"$it"} // this will create array with "0", "1", "2" and so on. Ranges in Kotlin are closed, meaning that the start value and end value are included in the range. Indicates whether some other object is "equal to" this one. and appends the results to the given destination. Represents a 32-bit signed integer. Returns true if element is found in the collection. And array items can similarly be checked, either as primitive values or as nested objects or arrays. Kotlin has become one of the most popular JVM languages in the past few months. ; See the Kotlin Koans for more snippets to practice with. Accumulates value starting with the first element and applying operation from left to right Accumulates value starting with the first element and applying operation from left to right where key is the element itself and value is provided by the valueSelector function applied to that key. Returns the largest value among all values produced by selector function and appends only the non-null results to the given destination. Returns a list containing successive accumulation values generated by applying operation from left to right Returns a set containing all elements that are contained by both this collection and the specified collection. by the key returned by the given keySelector function applied to the element It is described in this KEEP. Returns true if no elements match the given predicate. The one you’ll encounter the most often is IntRange, but you can use LongRange and CharRange as well. Returns a Map containing the elements from the given collection indexed by the key Returns a list containing successive accumulation values generated by applying operation from left to right I have talked to many Android developers, and most of them are excited about Kotlin. For kotlin.String String Progressions have three essential properties: the first element, the last element, and a non-zero step. Appends all elements yielded from results of transform function being invoked on each element Kotlin Ranges. Returns the largest element or null if there are no elements. sliding along this collection with the given step, where each Returns single element, or null if the collection is empty or has more than one element. where first list contains elements for which predicate yielded true, Returns a list containing all elements of the original collection and then all elements of the given elements array. Returns an average value of elements in the collection. Returns true if the collection has no elements. Returns a single list of all elements yielded from results of transform function being invoked on each element of original collection. Groups values returned by the valueTransform function applied to each element of the original collection L lateinit These utility methods or extensions functions are better than what Java provides and they can get you substrings based on different conditions. Populates and returns the destination mutable map with key-value pairs Appends all elements that are instances of specified type parameter R to the given destination. Performs the given action on each element, providing sequential index with the element. Checks whether the specified value belongs to the range. Kotlin is being developed by JetBrains, who are responsible for the most famous IDEs out there, most notably IntelliJ IDEA. Reference 112 . Returns a list of results of applying the given transform function to The above subString method returns a new string that starts from the specified startIndex and ends at right before the length of the calling string. Returns a list containing all elements that are not null. Returns the first element matching the given predicate. Returns true if collection has at least one element. Creates a Sequence instance that wraps the original collection returning its elements when being iterated. 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