Hi ,

I am learning Go step by step. I have go through with slices and structs 
but this below code sample is using slices and structs both at a time.

Can anyone please explain this piece of code? this would be more helpful to 
me to understand this. Thank you!

var testCases = []struct {
 description string
 planet      Planet
 seconds     float64
 expected    float64
}{
 {
 description: "age on Earth",
 planet:      "Earth",
 seconds:     1000000000,
 expected:    31.69,
 },
 {
 description: "age on Mercury",
 planet:      "Mercury",
 seconds:     2134835688,
 expected:    280.88,
 },
 {
 description: "age on Venus",
 planet:      "Venus",
 seconds:     189839836,
 expected:    9.78,
 },
 {
 description: "age on Mars",
 planet:      "Mars",
 seconds:     2329871239,
 expected:    39.25,
 },
 {
 description: "age on Jupiter",
 planet:      "Jupiter",
 seconds:     901876382,
 expected:    2.41,
 },
 {
 description: "age on Saturn",
 planet:      "Saturn",
 seconds:     3000000000,
 expected:    3.23,
 },
 {
 description: "age on Uranus",
 planet:      "Uranus",
 seconds:     3210123456,
 expected:    1.21,
 },
 {
 description: "age on Neptune",
 planet:      "Neptune",
 seconds:     8210123456,
 expected:    1.58,
 },
}


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