let countOccurrences = (arr, value) => arr.reduce((a, v) => v === value ? a + 1 : a + 0, 0); let arr = [1,2,1,2,3,3,3,3]; console.log(countOccurrences(arr,3))//4 14.深拼合数组 // deepFlatten: 深拼合数组 // 使用递归。使用Array
constcountOccurrences= (arr, value) => arr.reduce((a, v) =>v === value ? a +1: a +0,0); countOccurrences([1,2,3,2,2,5,1],1); 循环数组,每遇到一个值与给定值相等,即加1,同时将加上之后的结果作为下次的初始值。 See the Penreduce count occurrencesby 糊一笑 (@rynxiao) onCode...
1 2 const countOccurrences = (arr, value) => arr.reduce((a, v) => v === value ? a + 1 : a + 0, 0); countOccurrences([1, 2, 3, 2, 2, 5, 1], 1);循环数组,每遇到一个值与给定值相等,即加1,同时将加上之后的结果作为下次的初始值。
return Array.from( { length: Math.ceil(arr.length / size), }, (v, i) => arr.slice(i * size, i * size + size) ); } 检查数组中某元素出现的次数 function countOccurrences(arr, value) { return arr.reduce((a, v) => (v === value ? a + 1 : a + 0), 0); } 扁平化数组...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a), 0); countOccurrences([2,4,6,2,5,2], 2) // 3 countOccurrences([1,4,6,2,5,6], 6) // 2 ...
constcountOccurrences=(arr,val)=>arr.reduce((a,v)=>(v===val?a+1:a),0);countOccurrences([1,1,2,1,2,3],1);// 3 12. `deepFlatten`:递归扁平化数组 代码语言:javascript 复制 constdeepFlatten=arr=>[].concat(...arr.map(v=>(Array.isArray(v)?deepFlatten(v):v)));deepFlatten([...
使用Array.reduce()和Array.concat()来合并元素或数组。基本情况下, 对于等于1的depth停止递归。省略第二个元素,depth仅拼合到1的深度 (单个拼合)。const flattenDepth = (arr, depth = 1) => depth != 1 ? arr.reduce((a, v) => a.concat(Array.isArray(v) ? flattenDepth(v, depth - 1) : v...
5.`arrayToHtmlList`:数组转`li`列表 此代码段将数组的元素转换为标签,并将其附加到给定ID的列表中。 const arrayToHtmlList = (arr, listID) => (el => ( (el = document.querySelector('#' + listID)), (el.innerHTML += arr.map(item => `${item}`).join('')) ))()...
slice功能:截取字符串,不会改变原数组,slice(起始索引,结束索引(不包含)) splice功能:添加,替换,修改原数组,会改变原数组的值 splice(index,count) index:起始位置的索引 count:要删除元素的个数 返回的是被删除元素的数组... 查看原文 js数组一些方法使用记录 ,直到结束参数(不包括)为止,返回新数组,不改变原...
inline_script (default: true)— escape HTML comments and the slash in occurrences of in strings keep_quoted_props (default: false)— when turned on, prevents stripping quotes from property names in object literals. max_line_len (default: false)— maximum line length (for uglified code)...