How do I apply conditional formatting in .map() in nodejs? - node.js

Question

I have the below data
[
{
"ID": "1",
"SIZE": 2.21,
"Metal": "Steel",
"Class": "Non magnetic",
"Density":3.9,
},
{
"ID": "2",
"SIZE": 1.25,
"Metal": "Iron",
"Class": "magnetic",
"Density":4.2,
},
{
"ID": "3",
"SIZE": 15.5,
"Metal": "Water",
"Class": "non magnetic",
"Density": 1.3,
},
{
"ID": "4",
"SIZE": 9.5,
"Metal": "Steel",
"Class": "non magnetic",
"Density": 1.2,
}
{
"ID": "5",
"SIZE": 3.2,
"Metal": "Water",
"Class": "non magnetic",
"Density": 1.0,
}
]
Goal is to create a new map and filter the data. If name is steel or iron, we need to get the size from the previous object . Likewise if metal is water, then we need to the skip the currect object and check in the next value in the next object. If the subsequent values are water too, then we need to return "Invalid". I tried the below piece of code but it is not returning the desired output
data.map((temp, i) =>{
if (temp.METAL.toUpperCase() != 'WATER')
{
res.push({
ID: temp.ID,
SIZE: temp.SIZE,
Priortosize: data[i + 1] ? data[i + 1].SIZE: "Invalid",
Metal: temp.METAL
Class: temp.CLASS,
Density: temp.DENSITY
})
}
})
It returns empty value if the last metal is water. Can you please help?

Answer 1

First, Javascript is a case-sensitive language.
data.Metal != data.METAL
Use data.Metal, just as it is in the data object.
I also saw that you forgot some commas in your example, both in the data object and in the push of your code.
data = [
{
"ID": "1",
"SIZE": 2.21,
"Metal": "Steel",
"Class": "Non magnetic",
"Density":3.9,
},
{
"ID": "2",
"SIZE": 1.25,
"Metal": "Iron",
"Class": "magnetic",
"Density":4.2,
},
{
"ID": "3",
"SIZE": 15.5,
"Metal": "Water",
"Class": "non magnetic",
"Density": 1.3,
},
{
"ID": "4",
"SIZE": 9.5,
"Metal": "Steel",
"Class": "non magnetic",
"Density": 1.2,
},
{
"ID": "5",
"SIZE": 3.2,
"Metal": "Water",
"Class": "non magnetic",
"Density": 1.0,
}
]
res = []
data.map((temp, i) =>{
if (temp.Metal.toUpperCase() != 'WATER')
{
res.push({
ID: temp.ID,
SIZE: temp.SIZE,
Priortosize: data[i + 1] ? data[i + 1].SIZE: "Invalid",
Metal: temp.Metal,
Class: temp.Class,
Density: temp.Density
})
}
})
console.log(JSON.stringify(res, null, 0))