本篇文章给大家总结了一些javascript遍历数组的几种方法。有一定的参考价值,有需要的朋友可以参考一下,希望对大家有所帮助。
有几种方法可以遍历数组,下面将逐个罗列!
while循环
复制let index =0;const array =[1,2,3,4,5];while(index < array.length){
console.log(array[index]);
index ;}
for循环
复制const array =[1,2,3,4,5];for(let index=0;index
Math.pow(x,2);const squares = array.map(square);
console.log(`${array}`);
console.log(`${squares}`)
reduce
reduce()方法对累加器和数组中的每个元素(从左到右)应用一个函数,以将其减小为单个值
复制const array =[1,2,3,4,5];const sum =(x,y)=> x y;const array_sum = array.reduce(sum,0);
console.log(`the sum of arrray:${array} is ${array_sum}`);
filter
根据布尔函数过滤筛选数组中的元素
复制const array =[1,2,3,4,5];const even = x => x%2===0;const even_array = array.filter(even);
console.log(`even numbers in array ${array} : ${even_array}`);
every
得到了一个数组,想测试每个元素是否满足给定条件
复制const array =[1,2,3,4,5,8];const under_six = x => x<6;if(array.every(under_six)){
console.log(`every elemnet in the array is less than 6`);}else{
console.log(`at least one element in the array was bigger than 6`);}
some
测试是否至少有一个元素与布尔函数匹配
复制const array =[2,4,5,6,8];const over_five = x => x>5;if(array.some(over_five)){
console.log(`at least one element bigger than 5 was found`);}else{
console.log(`no element bigger than 5 was found`);}
到此就结束啦,如果还有其他的欢迎补充!
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