Array.prototype.some()

const array = [1, 2, 3, 4, 5];

// Checks whether an element is even
const even = (element) => element % 2 === 0;

console.log(array.some(even));
// Expected output: true

function isBiggerThan10(element, index, array) {
  return element > 10;
}
[2, 5, 8, 1, 4].some(isBiggerThan10); // false
[12, 5, 8, 1, 4].some(isBiggerThan10); // true

[2, 5, 8, 1, 4].some((elem) => elem > 10); // false
[12, 5, 8, 1, 4].some((elem) => elem > 10); // true

const fruits = ["apple", "banana", "mango", "guava"];

function checkAvailability(arr, val) {
  return arr.some(function (arrVal) {
    return val === arrVal;
  });
}

checkAvailability(fruits, "kela"); // false
checkAvailability(fruits, "banana"); // true

const fruits = ["apple", "banana", "mango", "guava"];

function checkAvailability(arr, val) {
  return arr.some((arrVal) => val === arrVal);
}

checkAvailability(fruits, "kela"); // false
checkAvailability(fruits, "banana"); // true

const TRUTHY_VALUES = [true, "true", 1];

function getBoolean(value) {
  "use strict";

  if (typeof value === "string") {
    value = value.toLowerCase().trim();
  }

  return TRUTHY_VALUES.some(function (t) {
    return t === value;
  });
}

getBoolean(false); // false
getBoolean("false"); // false
getBoolean(1); // true
getBoolean("true"); // true

//   ECMA-262, 5- , 15.4.4.17
//  (en): http://es5.github.io/#x15.4.4.17
//  (ru): http://es5.javascript.ru/x15.4.html#x15.4.4.17
if (!Array.prototype.some) {
  Array.prototype.some = function (fun /*, thisArg*/) {
    "use strict";

    if (this == null) {
      throw new TypeError("Array.prototype.some called on null or undefined");
    }

    if (typeof fun !== "function") {
      throw new TypeError();
    }

    var t = Object(this);
    var len = t.length >>> 0;

    var thisArg = arguments.length >= 2 ? arguments[1] : void 0;
    for (var i = 0; i < len; i++) {
      if (i in t && fun.call(thisArg, t[i], i, t)) {
        return true;
      }
    }

    return false;
  };
}