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Javascript typedArray.includes()用法及代码示例


typedArray.includes()是JavaScript中的内置函数,用于检查给定的typedArray是否包含特定元素,并因此返回true和false。句法:

typedarray.includes(Element, Index);

参数:它接受下面指定的两个参数-

  • Element:它是在typedArray中搜索的元素。
  • Index:它是应该开始搜索的typedArray形式中元素的索引。其默认值为零(0),并且是可选的。

返回值:如果元素存在于给定的typedArray中,则它返回布尔值true,否则返回false。

JavaScript代码显示此函数的工作方式:

代码1:
<script> 
  
    // Creating some typedArrays 
    const A = new Uint8Array([ 1, 2, 3, 4, 5 ]); 
    const B = new Uint8Array([ 5, 10, 15, 20 ]); 
    const C = new Uint8Array([ 0, 2, 4, 6,, 8, 10 ]); 
    const D = new Uint8Array([ 1, 3, 5, 7, 9 ]); 
  
    // Calling include() function 
    a = A.includes(2) 
    b = B.includes(15, 1) 
    c = C.includes(6) 
    d = D.includes(9, 1) 
  
    // Printing true or false, either the element 
    // is present in the typedArray or not 
    document.write(a + "<br>"); 
    document.write(b + "<br>"); 
    document.write(c + "<br>"); 
    document.write(d); 
  
</script>

输出:

true
true
true
true

代码2:

<script> 
  
    // Creating some typedArrays 
    const A = new Uint8Array([ 1, 2, 3, 4, 5 ]); 
    const B = new Uint8Array([ 5, 10, 15, 20 ]); 
    const C = new Uint8Array([ 0, 2, 4, 6,, 8, 10 ]); 
    const D = new Uint8Array([ 1, 3, 5, 7, 9 ]); 
  
    // Calling include() function 
    a = A.includes(6) 
    b = B.includes(21, 1) 
    c = C.includes(6, 4) 
    d = D.includes(0) 
  
    // Printing true or false, either the element 
    // is present in the typedArray or not 
    document.write(a + "<br>"); 
    document.write(b + "<br>"); 
    document.write(c + "<br>"); 
    document.write(d); 
  
</script>

输出:

false
false
false
false


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注:本文由纯净天空筛选整理自Kanchan_Ray大神的英文原创作品 JavaScript | typedArray.includes() with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。