Convert text input to lowercase - Javascript

Question

Having trouble creating a case insensitive search in my Ionic app. I have the following that pushes tags into firebase. How can I convert the entire array to lowercase before going into the database?

$scope.addToTag = function(tag) {
  if ($scope.productTags.indexOf(tag) == -1)
    $scope.productTags.push(tag);

  $scope.productTags[tag] = true;

  var productTags = {};
  var addToTag = function(tag) {
    productTags[tag] = true;
  };
};

Thanks in advance!

Answer 1

You can use a map, for in, for of, for loop, for each ... to this. Combined with toLowerCase function for each element.

Usage with map:

var tags = ['ANDROID', 'iOS', 'Windows Phone'];

var lowerCaseTags = tags.map(function (tag) {
    return tag.toLowerCase();
});

console.log(lowerCaseTags);

Usage with for in:

var tags = ['ANDROID', 'iOS', 'Windows Phone'];
var lowerCaseTags = [];

for (var tag in tags) {
    lowerCaseTags.push(tag.toLowerCase());
}

console.log(lowerCaseTags);

Usage with for of:

var tags = ['ANDROID', 'iOS', 'Windows Phone'];
var lowerCaseTags = [];

for (var tag of tags) {
    lowerCaseTags.push(tag.toLowerCase());
}

console.log(lowerCaseTags);

Usage with for loop:

var tags = ['ANDROID', 'iOS', 'Windows Phone'];
var lowerCaseTags = [];

for (var i = 0; i < tags.length; i++) {
    var tag = tags[i];
    lowerCaseTags.push(tag.toLowerCase());
}

console.log(lowerCaseTags);

Usage with forEach:

var tags = ['ANDROID', 'iOS', 'Windows Phone'];
var lowerCaseTags = [];

tags.forEach(function(tag) {
    lowerCaseTags.push(tag.toLowerCase());
});

console.log(lowerCaseTags);