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I have a 2 dimensional array

var years = [[-1,"0 years"], [1,"< 1 year"], [2,"1-3 years"], [3,"> 3 years"]];

And I want to get the number of years based on user Input, which is -1,1,2,3 how can I do it in Javascript?

I'm trying using years[years_input] but I don't get the correct value.

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5 Answers 5

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1

You can use the find() method.

var years = [[-1,"0 years"], [1,"< 1 year"], [2,"1-3 years"], [3,"> 3 years"]];

let input = +prompt('enter the index');
console.log(years.find(x => x[0] === input)[1])

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2 Comments

Thanks, but that's not what I'm trying to get. Basically I need to get "0 years" "< 1 year" based on the input which is -1 or 1 or 2 or 3
Perfect, works like a charm, I'll accept your answer in 8 min, thanks :)
1

You can use includes:

var years = [[-1,"0 years"], [1,"< 1 year"], [2,"1-3 years"], [3,"> 3 years"]];

var input = +prompt()

for(var i = 0; i < years.length; i++) {
  if (years[i].includes(input)) {
  console.log(years[i][1])
  break
  }
}

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1

Get the first element of the array (you need to use find for edge cases like -1):

const years = [[-1,"0 years"], [1,"< 1 year"], [2,"1-3 years"], [3,"> 3 years"]];
const index = 3;
const [, res] = years.find(([n]) => n == index);
console.log(res);

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7 Comments

Thanks, but that's not what I'm trying to get. Basically I need to get "0 years" "< 1 year" based on the input which is -1 or 1 or 2 or 3
No problem @Radu033, always glad to help.
@JackBashford This won't work when the input is -1.
Fixed @Kobe, any better?
@Shubh because we want the second item - it's a 2d Array
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1

Try this,hope it works

let years = [
  [-1, "0 years"],
  [1, "< 1 year"],
  [2, "1-3 years"],
  [3, "> 3 years"]
];

function getYear(year) {

  return years.find(el => el.indexOf(year) > -1)[1]

}

console.log(getYear(-1))
console.log(getYear(1))
console.log(getYear(2))
console.log(getYear(3))

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Comments

0

You could take a Map with Map#get and the key for getting the value.

var years = [[-1, "0 years"], [1, "< 1 year"], [2, "1-3 years"], [3, "> 3 years"]],
    yearsMap = new Map(years);

console.log(yearsMap.get(1));

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