const _ = require('lodash');
// compact function
function compact(array){
let resIndex = 0;
const result = [];
if(array == null){
return result;
}
for(const value of array){
if(value){
result[resIndex++] = value;
}
}
return result;
}
let test = [0, 1, '', 2, false, 3, null, 4, undefined, 5, NaN, 6];
compact(test)
_.compact(test)
/* 使用while进行数组的循环 */
function compact_use_while(array) {
// 判断array是否为空
if(array == null) {
return [];
}
let result = [];
let index = 0;
let resIndex = 0;
let value;
const length = array.length;
while(index < length) {
value = array[index];
if(value) {
result[resIndex++] = value;
}
index++;
}
return result;
}
compact_use_while(test)
/* 使用数组的map方法 */
function compact_use_map(array) {
// 判断array是否为空
if(array == null) {
return [];
}
let result = [];
array.map((value) => {
if(value) {
result.push(value);
}
});
return result;
}
compact_use_map(test)
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