數(shù)組去重
1.for循環(huán)
var myArray = [1, 2, 3, 4, 5, 2];
function getArray(array) {
var newArray = [];
var i = 0, l = array.length
for (; i < l; i++) {
for (var j = i + 1; j < l; j++) {
if (array[i] === array[j]) {
// i++ ++i的問題~~別忘記了
j = ++i;
}
}
newArray.push(array[i]);
}
return newArray;
}
console.log(getArray(myArray));
2.0 少了多少行代碼~~~
var arr = [0, 0, 1, 1, 2, 2]
var result = [0, 0, 1, 1, 2, 2].filter((item, index) => arr.indexOf(item) === index)
console.log(result);
3.0 indexOf
function getArray(array){
var newArray = [];
for(var i = 0; i < array.length; i++){
if(newArray.indexOf(array[i]) == -1){
newArray.push(array[i]);
}
}
return newArray;
}
var myArray = [1,2,3,4,5,2];
console.log(getArray(myArray));
4.0 map/forEach
var arr = [1,2,3,4,5,2,3,2];
function getArray(arr){
var newArr = [];
arr.map(function(item,index,arr){
if(arr.indexOf(item,index+1) == -1){
newArr.push(item)
}
})
return newArr;
}
console.log(getArray(arr));
- ES6 Set() 方法
new Set([1,2,3,4,5,2,3,2])
