tech(array): array some by example

Author: shangan23

array/some.js

@@ -0,0 +1,87 @@
+/**
+ * The some() method tests whether at least one element in the array passes the test implemented by the provided function.
+ * It returns true if, in the array, it finds an element for which the provided function returns true;
+ * otherwise it returns false. It doesn't modify the array.
+ */
+const log = console.log
+log()
+const array = [1, 2, 3, 4, 5]
+
+// checks whether an element is even
+const even = (element) => element % 2 === 0
+log('checks whether an element is even', array.some(even))
+// expected output: true
+log()
+// Testing value of array elements
+
+const arr = [2, 5, 8, 1, 4]
+const set = [(12, 5, 8, 1, 4)]
+function isBiggerThan10(element, index, array) {
+  return element > 10
+}
+log('Testing value of array elements', arr.some(isBiggerThan10)) // false
+log('Testing value of array elements', set.some(isBiggerThan10)) // true
+
+// Testing array elements using arrow functions
+log()
+log(
+  'Testing array elements using arrow functions',
+  set.some((x) => x > 10)
+) // false
+log(
+  'Testing array elements using arrow functions',
+  arr.some((x) => x > 10)
+) // true
+log()
+// Checking whether a value exists in an array
+const fruits = ['apple', 'banana', 'mango', 'guava']
+
+function checkAvailability(arr, val) {
+  return arr.some(function (arrVal) {
+    return val === arrVal
+  })
+}
+
+log(
+  'Checking whether a value exists in an array',
+  checkAvailability(fruits, 'kela')
+) // false
+log(
+  'Checking whether a value exists in an array',
+  checkAvailability(fruits, 'banana')
+) // true
+
+// Checking whether a value exists using an arrow function
+
+function checkAvailabilityArrow(arr, val) {
+  return arr.some((arrVal) => val === arrVal)
+}
+
+log(
+  'Checking whether a value exists in an array',
+  checkAvailabilityArrow(fruits, 'kela')
+) // false
+log(
+  'Checking whether a value exists in an array',
+  checkAvailabilityArrow(fruits, 'banana')
+) // true
+log()
+// Converting any value to Boolean
+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
+  })
+}
+
+log('Converting any value to Boolean', getBoolean(false)) // false
+log('Converting any value to Boolean', getBoolean('false')) // false
+log('Converting any value to Boolean', getBoolean(1)) // true
+log('Converting any value to Boolean', getBoolean('true')) // true
+log()