The reduce() method has the following syntax:
let arr = ; arr.reduce(callback(acc, curVal, index, src), initVal);
Accumulator | required: This is the accumulated value previously returned from the function or the initial value if it was supplied.
Current Value | required: This is the value of the current element in the array.
Current Index | optional: This is the index of the current element in the array.
Source Array | optional: This is the array object reduce() was called upon.
Initial Value | optional: This is the initial value to be passed to the function. If no initial value is supplied, the first element in the array will be used as the initial accumulator value and the second element becomes the current value
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