Taken from DailyCodingProblem:

Given a list of numbers and a number k, return whether any two numbers from the list add up to k.

For example, given [10, 15, 3, 7] and k of 17, return true since 10 + 7 is 17.

Solution

This is the answer I came up with:

const solution = (numbers: Array<number>, k: number): boolean | any => {
  for (let num of numbers) {
    let rem = k - num
    return (numbers.includes(rem)) ? true : false
  }
}

Testing

Solution tested in REPL:

https://www.typescriptlang.org/play?#code/MYewdgzgLgBBIBsCuUCW4YF4YAoxIFsAjAUwCcIAuGAQTLIEMBPAHn2PID4AaGAa2rtSZAJTUiIRCQZgYAHxgymWTjADeAWABQMGADMQZXAhKx2MEHphDyEEeu27dJ2GRIEs-GAFprhR05uUEhksniEwhAAdKhgwMgAJiQQOG4EIvYA-DBQZEgkMNR6DAgQJAEAvtpVWtqgkFJRCCAA5jgB8Mho4DgA2gCMAAy8-QCsvADMvADsALoj0yLa9gD0Kzl55VpAA