循环遍历数组并在Javascript中根据条件替换值

Question

My array and pseudo code are as follows. I do need help with replacing values with stirng on condition. I tried below but can't move on.

var = [5000, 2000, 4030, 1100];

for (var i = 0; i < arR.length; i++) {
    if (arR.includes >= 5000) {
        (‘senior’);
    } else if (arR.includes >= 2000) {
        console.log(‘mid’);
    } else {
        (‘junior’);
    }
}

Expected result: var = [senior, mid, mid, junior];

Answer 1

 let array = [5000, 2000, 4030, 1100]; let TransformedArray = array.map(item=>item>=5000 ? 'senior' : item>=2000 ? 'mid' : 'junior'); console.log(TransformedArray);

Answer 2

You can do that with Array.map() and use any conditional operator to filter the result im using ternary here.

 var someArray = [5000, 2000, 4030, 1100]; var anotherArray = someArray.map(function (rank) { return rank >= 5000 ? 'senior' : rank >= 2000 ? 'mid' : 'junior'; }); console.log(anotherArray);

if you need it this way for easy understanding of if else and for each

 var someArray = [5000, 2000, 4030, 1100]; var newArray = []; someArray.forEach(function (rank) { if (rank >= 5000) { newArray.push('senior'); } else if (rank >= 2000) { newArray.push('mid'); } else { newArray.push('junior'); } }); console.log(newArray);

Answer 3

var array = [5000, 2000, 4030, 1100];

function converter(item) {
  return item >= 5000 && 'senior' || item >= 2000 && 'mid' || item >= 0 && 'junior';
}

var newArray = array.map(converter)
console.log(newArray);

The function returns false if an element is not a number (or smaller than 0). If you want to change that, you should cover the return with an if statement.

Answer 4

Just replace that element in the array, also iterate through the actual elements in your for-loop instead of checking if the value exists

var arR = [5000, 2000, 4030, 1100];

for (var i = 0; i < arR.length; i++) {
    if (arR[i] >= 5000) {
        arR[i] = "senior";
    } else if (arR[i] >= 2000) {
        arR[i] = "mid"
    } else {
        arR[i] = "junior"
    }
}

What I am doing here is checking each value, and if it satisfies a condition, then change it to the string it needs to be