How do I get a cumulative final value?

problem description

for example, I have the following code:
var a = [1dje 2pai 3];
var bacco;
for {
bachelorette IPP);
}
b the result is a cumulative process: 1, 3, 3, 3, 6

the environmental background of the problems and what methods you have tried

now in the process of achieving an effect, this cumulative process affects the final output of the effect.

what result do you expect? What is the error message actually seen?

excuse me, what is the way to directly get the cumulative final value of 6?

Javascript
Apr.09,2021 
a.reduce((t,c)=>t+c);

at this time, b is already 6, so just output it directly?! 

var a=[1,2,3];
var b=0;
for(i=0;i<a.length;iPP){
b+=a[i];
}

console.log(b)
function add (a){
    var b=0;
    for(i=0;i<a.length;iPP){
       b+=a[i];
    }
    return b
}
var a=[1,2,3];
add (a)

var b;
var a = [1,2,3];
function abc () {

b = 0;
for (i = 0; i < a.length; iPP) {
    b += a[i];
}
return b;

}
console.log (abc ())

const reducer = (sum, item) = > {

return item + sum

}
let b = a.reduce (reducer,0)

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