Ways to append a number to the start or end of an array using JavaScript

Question

Ways to append a number to the start or end of an array using JavaScript

Can you help me figure out why the function to order the "s" array from minor to major is adding the number at the end instead of the beginning? The if statement seems to be true (2 < 7 = true) but the logic is not working as expected. Any advice on how to fix this?

const s = [5, 7, 2];

function editInPlace() {
  var newS = []
  for (let i = 0; i < s.length; i++) {
    if (console.log(s[i] < newS[i - 1])) {
      newsS.unshift(s[i])
      console.log("Why is it adding at the end even though condition is true: " + newS.splice(s[i]));
    } else {
      newS.push(s[i]);
      console.log("newS value is: " + newS)
    }
  }
}
editInPlace();

javascript arrays loops

Answer 1

Answer №1

When you execute console.log(anything)

, the output will be undefined. Therefore,

console.log(s[i] < newS[i - 1])

always evaluates to falsy. It is advisable to move this line of code out of the if condition.

let array = [3, 8, 6];

function manipulateArray() {
  let newArray = [];
  for (let i = 0; i < array.length; i++) {
    console.log(array[i] < newArray[i - 1]);
    if (array[i] < newArray[i - 1]) {
      newArray.unshift(array[i])
      console.log("If statement was true, added at beginning: " + newArray.splice(array[i]));
    } else {
      newArray.push(array[i]);
      console.log("newArray is now: " + newArray)
    }
  }
}
manipulateArray();

Answer 2

When you execute console.log(anything)

, the output will be undefined. Therefore,

console.log(s[i] < newS[i - 1])

always evaluates to falsy. It is advisable to move this line of code out of the if condition.

let array = [3, 8, 6];

function manipulateArray() {
  let newArray = [];
  for (let i = 0; i < array.length; i++) {
    console.log(array[i] < newArray[i - 1]);
    if (array[i] < newArray[i - 1]) {
      newArray.unshift(array[i])
      console.log("If statement was true, added at beginning: " + newArray.splice(array[i]));
    } else {
      newArray.push(array[i]);
      console.log("newArray is now: " + newArray)
    }
  }
}
manipulateArray();

Ways to append a number to the start or end of an array using JavaScript

Answer №1

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