Sending back various results in a javascript function

Question

Sending back various results in a javascript function

I am attempting to correlate test scores with values from the level array in order to extract selected values into an output array. However, when I execute the following script in the Firebug console, I encounter the error message "TypeError: level is undefined". This confuses me as I believe that the level variable is properly defined; perhaps the error is originating from a different source.

var level = [[905,990,"91% - 100%","International Professional Proficiency","Able to communicate effectively in any situation"],
    [785,900,"79% - 90%","Working Proficiency Plus","Able to satisfy most work requirements with language that is often, but not always, acceptable and effective"],
    [605,780,"61% - 78%","Limited Working Proficiency","Able to satisfy most social demands and limited work requirements "],
    [405,600,"41% - 60%","Elementary Proficiency Plus","Can initiate and maintain predictable face-to-face conversations and satisfy limited social demands"],
    [255,400,"26% - 40%","Elementary Proficiency","Speaker has functional, but limited proficiency. Able to maintain very simple face-to-face conversations on familiar topics"],
    [10,50, "0 - 25%","Basic Proficiency","Able to satisfy immediate survival needs"]];

function between(x, min, max) {                     
  return x >= min && x <= max;
}

var newProfic =  function profLevel(x, level) {
    var prof1, prof2, prof3;
    for(var i=0; i<level.length; i++) {
      if( between(x, level[i][0], level[i][1])) {
        prof1 = levell[i][2];
        prof2 = level[i][3];
        prof3 = level[i][4];
      }     
    }
    return  [ prof1,   prof2,  prof3 ];
  }

  var profic = newProfic();
  var prof1 = profic[0];
  var prof2 = profic[1]; 
  var prof3 = profic[2];  
  newProfic( 300,  level);

Any insights or assistance would be greatly appreciated. Thank you

javascript arrays

Answer 1

Answer №1

I recommend utilizing Array#filter followed by Array#map to extract the desired elements.

This suggestion accounts for scenarios where there may be zero, one, or multiple result sets.

var level = [[905, 990, "91% - 100%", "International Professional Proficiency", "Able to communicate effectively in any situation"], [785, 900, "79% - 90%", "Working Proficiency Plus", "Able to satisfy most work requirements with language that is often, but not always, acceptable and effective"], [605, 780, "61% - 78%", "Limited Working Proficiency", "Able to satisfy most social demands and limited work requirements "], [405, 600, "41% - 60%", "Elementary Proficiency Plus", "Can initiate and maintain predictable face-to-face conversations and satisfy limited social demands"], [255, 400, "26% - 40%", "Elementary Proficiency", "Speaker has functional, but limited proficiency. Able to maintain very simple face-to-face conversations on familiar topics"], [10, 50, "0 - 25%", "Basic Proficiency", "Able to satisfy immediate survival needs"]];

function between(x, min, max) {
    return x >= min && x <= max;
}

function profLevel(x, level) {
    return level.filter(function (a) {
        return between(x, a[0], a[1]);
    }).map(function (a) {
        return [a[2], a[3], a[4]];
    });
}

console.log(profLevel(300, level));

.as-console-wrapper { max-height: 100% !important; top: 0; }

This approach assumes there will be only one resulting set of data.

var level = [[905, 990, "91% - 100%", "International Professional Proficiency", "Able to communicate effectively in any situation"], [785, 900, "79% - 90%", "Working Proficiency Plus", "Able to satisfy most work requirements with language that is often, but not always, acceptable and effective"], [605, 780, "61% - 78%", "Limited Working Proficiency", "Able to satisfy most social demands and limited work requirements "], [405, 600, "41% - 60%", "Elementary Proficiency Plus", "Can initiate and maintain predictable face-to-face conversations and satisfy limited social demands"], [255, 400, "26% - 40%", "Elementary Proficiency", "Speaker has functional, but limited proficiency. Able to maintain very simple face-to-face conversations on familiar topics"], [10, 50, "0 - 25%", "Basic Proficiency", "Able to satisfy immediate survival needs"]];

function between(x, min, max) {
    return x >= min && x <= max;
}

function profLevel(x, level) {
    var index = -1;
    level.some(function (a, i) {
        if (between(x, a[0], a[1])) {
            index = i;
            return true;
        }
    });
    if (index >= 0) {
        return [level[index][2], level[index][3], level[index][4]];
    }
}

console.log(profLevel(300, level));

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 2

I recommend utilizing Array#filter followed by Array#map to extract the desired elements.

This suggestion accounts for scenarios where there may be zero, one, or multiple result sets.

var level = [[905, 990, "91% - 100%", "International Professional Proficiency", "Able to communicate effectively in any situation"], [785, 900, "79% - 90%", "Working Proficiency Plus", "Able to satisfy most work requirements with language that is often, but not always, acceptable and effective"], [605, 780, "61% - 78%", "Limited Working Proficiency", "Able to satisfy most social demands and limited work requirements "], [405, 600, "41% - 60%", "Elementary Proficiency Plus", "Can initiate and maintain predictable face-to-face conversations and satisfy limited social demands"], [255, 400, "26% - 40%", "Elementary Proficiency", "Speaker has functional, but limited proficiency. Able to maintain very simple face-to-face conversations on familiar topics"], [10, 50, "0 - 25%", "Basic Proficiency", "Able to satisfy immediate survival needs"]];

function between(x, min, max) {
    return x >= min && x <= max;
}

function profLevel(x, level) {
    return level.filter(function (a) {
        return between(x, a[0], a[1]);
    }).map(function (a) {
        return [a[2], a[3], a[4]];
    });
}

console.log(profLevel(300, level));

.as-console-wrapper { max-height: 100% !important; top: 0; }

This approach assumes there will be only one resulting set of data.

var level = [[905, 990, "91% - 100%", "International Professional Proficiency", "Able to communicate effectively in any situation"], [785, 900, "79% - 90%", "Working Proficiency Plus", "Able to satisfy most work requirements with language that is often, but not always, acceptable and effective"], [605, 780, "61% - 78%", "Limited Working Proficiency", "Able to satisfy most social demands and limited work requirements "], [405, 600, "41% - 60%", "Elementary Proficiency Plus", "Can initiate and maintain predictable face-to-face conversations and satisfy limited social demands"], [255, 400, "26% - 40%", "Elementary Proficiency", "Speaker has functional, but limited proficiency. Able to maintain very simple face-to-face conversations on familiar topics"], [10, 50, "0 - 25%", "Basic Proficiency", "Able to satisfy immediate survival needs"]];

function between(x, min, max) {
    return x >= min && x <= max;
}

function profLevel(x, level) {
    var index = -1;
    level.some(function (a, i) {
        if (between(x, a[0], a[1])) {
            index = i;
            return true;
        }
    });
    if (index >= 0) {
        return [level[index][2], level[index][3], level[index][4]];
    }
}

console.log(profLevel(300, level));

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 3

Answer №2

The issue at hand is:

ReferenceError: levell is not defined

An extra l was mistakenly added to one of the variables causing this error.

Another mistake found:

var profic = newProfic();

Calling newProfic without specifying the second argument results in it being undefined.

var newProfic =  function profLevel(x, level) {

The second argument is level, hence why it is undefined.

Answer 4

The issue at hand is:

ReferenceError: levell is not defined

An extra l was mistakenly added to one of the variables causing this error.

Another mistake found:

var profic = newProfic();

Calling newProfic without specifying the second argument results in it being undefined.

var newProfic =  function profLevel(x, level) {

The second argument is level, hence why it is undefined.

Sending back various results in a javascript function

Answer №1

Answer №2

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