immutable-json-patch/lib/esm/utils.js

Immutable JSON patch with support for reverting operations

/**
 * Test deep equality of two JSON values, objects, or arrays
 */
// TODO: write unit tests
export function isEqual(a, b) {
  // FIXME: this function will return false for two objects with the same keys
  //  but different order of keys
  return JSON.stringify(a) === JSON.stringify(b);
}

/**
 * Test whether two values are strictly equal
 */
export function strictEqual(a, b) {
  return a === b;
}

/**
 * Get all but the last items from an array
 */
// TODO: write unit tests
export function initial(array) {
  return array.slice(0, array.length - 1);
}

/**
 * Get the last item from an array
 */
// TODO: write unit tests
export function last(array) {
  return array[array.length - 1];
}

/**
 * Test whether array1 starts with array2
 * @param array1
 * @param array2
 * @param [isEqual] Optional function to check equality
 */
export function startsWith(array1, array2) {
  let isEqual = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : strictEqual;
  if (array1.length < array2.length) {
    return false;
  }
  for (let i = 0; i < array2.length; i++) {
    if (!isEqual(array1[i], array2[i])) {
      return false;
    }
  }
  return true;
}

/**
 * Test whether a value is an Object or an Array (and not a primitive JSON value)
 */
// TODO: write unit tests
export function isObjectOrArray(value) {
  return typeof value === 'object' && value !== null;
}
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