FAQ: Code Challenges: JavaScript Fundamentals - calculateWeight()


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

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This exercise can be found in the following Codecademy content:

Web Development

FAQs on the exercise calculateWeight()

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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.”}



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?


please see this topic:

FAQ: Code Challenges: JavaScript Fundamentals - tipCalculator()

different exercise, but same issue.


You just made my day. Thank You!