JAVASCRIPT

how to convert array to uppercase in javascript

var a = ['this','is','test'];

a.map(f=>{ return f.toUpperCase(); });

js to uppercase

const string = "A string";

const upperCase = string.toUpperCase();
console.log(upperCase); // -> A STRING

const lowerCase = string.toLowerCase();
console.log(lowerCase); // -> a string

convert an array to uppercase or lowercase js

var fruits = ["Banana", "Orange", "Apple", "Mango"];
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string = fruits.join(' ').toUpperCase();
// Output"BANANA ORANGE APPLE MANGO"

convert all value to uppercase in array

array_map('strtoupper', $array);

how to make all elements of array uppercase using javascript Array prototype

// how to make all elements of array uppercase using javascript Array prototype
Array.prototype.myUcase = function() {
  for (let i = 0; i < this.length; i++) {
    this[i] = this[i].toUpperCase();
  }
};

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.myUcase();
console.log(fruits); // [ 'BANANA', 'ORANGE', 'APPLE', 'MANGO' ]