Learn how to use the Set has() method in JavaScript to check for the presence of an element in a Set collection. Explore examples and key features.
The has() Method Example // Create a Set constletters =newSet(["a","b","c"]); // Does the Set contain "d"? answer = letters.has("d"); Try it Yourself » Description Thehas()method returnstrueif a specified value exists in a set. ...
The keys() Method Thekeys()method returns an Iterator object with the values in a Set: Note A Set has no keys, sokeys()returns the same asvalues(). This makes Sets compatible with Maps. Example 1 // Create a Set constletters =newSet(["a","b","c"]); ...
// 创建一个新的 Set let mySet = new Set(); // 添加元素 mySet.add(1); // Set { 1 } mySet.add(2); // Set { 1, 2 } mySet.add(1); // 重复的值不会被添加,结果仍然是 Set { 1, 2 } // 检查元素是否存在 console.log(mySet.has(1)); // true console.log(mySet.has(3...
本文基于Vue 3.2.30版本源码进行分析为了增加可读性,会对源码进行删减、调整顺序、改变部分分支条件的操作,文中所有源码均可视作为伪代码由于ts版本代码携...
Note:If you only need to execute a function one time, it's better to use thesetTimeout() method. Return the first longest word in the given stringsentence. For example, in the string"The quick brown fox jumps over the lazy dog"
1. === 在js中需要值相等类型相等 2. == 在js中值相等,类型不相等会自动转换 2.Array 全部Array的接口可以查看https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array let nameList = ['Brian', 'Xiang', 'Shuang'];//add item in the lastconst len = nameList.push...
jsCopy to Clipboard const myArray = ["zero", "one", "two"]; const myBoundMethod = function (sProperty) { console.log(arguments.length > 0 ? this[sProperty] : this); }.bind(myArray); myBoundMethod(); // prints "zero,one,two" because 'this' is bound to myArray in the ...
");return;}new_st->incStrong((void*)decVideoSurfaceRef);}else{jniThrowException(env,"java/lang/IllegalArgumentException","The surface has been released");return;}}//将GraphicBufferProducer 的对象new_st 设置给java层的mNativeSurfaceTexture//在java的反射中,通过字段获取对象,是通过 public Object ...
The values() method returns an Iterator object with the values in a set.The values() method does not change the original set.Syntaxset.values()ParametersNONEReturn ValueType Description Iterator An iterable object with the values of the set....