70 lines
1.3 KiB
Haxe
70 lines
1.3 KiB
Haxe
package lib;
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import haxe.Exception;
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class LambdaExtender {
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/**
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Returns the first element if there are exectly one element present.
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Throws exception if not.
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**/
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static public function single<T>(it:Iterable<T>):T {
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var elem:T = null;
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for (t in it) {
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if (elem != null) {
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throw new Exception("Multiple elements found");
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}
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elem = t;
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}
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if (elem == null) {
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throw new Exception("No element found");
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}
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return elem;
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}
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/**
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Like `single` but when no element was found return the default value.
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**/
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static public function singleOrDefault<T>(it:Iterable<T>, defaultValue:T):T {
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var elem:T = null;
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for (t in it) {
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if (elem != null) {
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throw new Exception("Multiple elements found");
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}
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elem = t;
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}
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if (elem == null) {
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return defaultValue;
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}
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return elem;
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}
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/**
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Returns the first element.
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Throws execption if no first element found.
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**/
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static public function first<T>(it:Iterable<T>):T {
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for (t in it) {
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return t;
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}
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throw new Exception("No element found");
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}
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/**
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Like `first` only if no first element was found it returns the defalt value.
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**/
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static public function firstOrDefault<T>(it:Iterable<T>, defaultValue:T):T {
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var iter = it.iterator();
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if (iter.hasNext()) {
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return iter.next();
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}
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return defaultValue;
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}
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}
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