Calculate the sum of an element of an array

let arr=[{name:'Zhang San',value:10},{name:'Li Si',value:11},{name:'Wang Wu',value:12},]let counts = 0for (let i = 0; i < arr.length; i++) {if (arr[i].value) {counts += arr[i].value}}console.log(counts) // 33

Or replace the code of the for loop with the following code,As shown

arr.map(res=>{return counts +=res.value})

There are other methods, welcome to add in the comment area~