Step 1: Understand the Problem

First, understand what a power function does: it multiplies the base number by itself the number of times specified by the exponent.

To write this function, we will need two inputs, which we'll call base and exponent.

function findPower(base, exponent) {

}

Step 2: Establish the Base Case

For any number raised to the power of zero, the answer is always 1. So, we need to cover this use case first.

function findPower(base, exponent) {
    if (exponent === 0) { 
       return 1; 
    }
}

Step 3: Implement the Power Function

We will loop from 1 to the value of exponent, continuously multiplying the base by itself.

function findPower(base, exponent) {
    if (exponent === 0) { 
       return 1; 
    } 
   let result = base;
   for(let i = 2; i <= exponent; i++) {
        result *= base; 
   } 
    return result;
}

Step 4: Enhance Efficiency

Instead of looping through the exponent, we can take advantage of Javascript's built-in power function using Math.pow().

function findPower(base, exponent) {
    if (exponent === 0) { 
       return 1; 
    } 

    return Math.pow(base, exponent);
}

Step 5: Simplifying the Function Further

However, we realize that Math.pow() even covers the base case. If the exponent is 0, it returns 1. So, we can simplify the function to one line.

function findPower(base, exponent) {
    return Math.pow(base, exponent);
}

Conclusion

The function findPower takes two numbers as arguments and calculates the power of the base to the exponent, which means multiplying the base by itself the number of times of the exponent.

The complete code is:

function findPower(base, exponent) {
    return Math.pow(base, exponent);
}