# FAQ: Code Challenges: JavaScript Fundamentals - calculateWeight()

#1

This community-built FAQ covers the “calculateWeight()” exercise from the lesson “Code Challenges: JavaScript Fundamentals”.

Paths and Courses
This exercise can be found in the following Codecademy content:

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#2

Hi everyone!
I don’t understand why this function only responds to the first if statement:

const calculateWeight = (earthWeight, planet) => {

if (planet = “Mercury”) {
return earthWeight * 0.378
}
else if (planet = “Venus”) {
return earthWeight * 0.907
}
else if (planet = “Mars”) {
return earthWeight * 0.377
}
else if (planet = “Jupiter”) {
return earthWeight * 2.36
}
else if (planet = “Saturn”) {
return earthWeight * 0.916
}
else {return “Invalid Planet Entry. Try: Mercury, Venus, Mars, Jupiter or Saturn.”}

}

console.log(calculateWeight(100,“Jupiter”));

In this example I try to log the planet weight of Jupiter if the earth weight was 100. But the function responds with the first if statement, in this case Mercury and gives me this: 37.8

Anyone who can help?

#3