Js array reduce accumulation method

Reduce is used as an accumulator to return the results of cumulative processing, often used for summation, etc

Basic syntax: arr. reduce (function() {}, initial value)

No initial value

        const arr=[1,5,8]
        const total=arr.reduce((prev,current)=> prev + current,)
        console.log(total)//total=14

There are initial values, which will affect the final result

        const total1=arr.reduce((prev,current)=> prev+current,10)
        console.log(total1)//total1=24

Calculate Salary Case

        const workers=[{name:'小张',salary:10000},{name:'小李',salary:12000},{name:'小明',salary:13000}]
        const expenditure=workers.reduce((prev,current)=>{
            return prev+current.salary
        },0)
        console.log(expenditure)// expenditure=35000