* Deep comparison of two values. * @param {mixed} a * @param {mixed} b * @return {boolean} True, if equal
(a, b)
| 11 | * @return {boolean} True, if equal |
| 12 | */ |
| 13 | static isEqual (a, b) { |
| 14 | // compare instance |
| 15 | if (a === b) { |
| 16 | return true |
| 17 | } |
| 18 | |
| 19 | // check null |
| 20 | if (a === null && b === null) { |
| 21 | return true |
| 22 | } else if (a === null || b === null) { |
| 23 | return false |
| 24 | } |
| 25 | |
| 26 | // check types |
| 27 | if (typeof a !== typeof b) { |
| 28 | return false |
| 29 | } |
| 30 | |
| 31 | // compare arrays |
| 32 | if (a instanceof Array) { |
| 33 | if (a.length !== b.length) { |
| 34 | return false |
| 35 | } |
| 36 | |
| 37 | // compare item by item |
| 38 | let i = -1 |
| 39 | let equal = true |
| 40 | while (equal && ++i < a.length) { |
| 41 | equal = ArrayUtil.isEqual(a[i], b[i]) |
| 42 | } |
| 43 | return equal |
| 44 | } |
| 45 | |
| 46 | // compare objects |
| 47 | if (a instanceof Object) { |
| 48 | // check if object knows how to compare itself to other objects |
| 49 | if (typeof a.isEqualTo === 'function') { |
| 50 | return a.isEqualTo(b) |
| 51 | } |
| 52 | if (typeof b.isEqualTo === 'function') { |
| 53 | return b.isEqualTo(a) |
| 54 | } |
| 55 | |
| 56 | // collect keys of objects |
| 57 | const keys = ArrayUtil.unique(Object.keys(a).concat(Object.keys(b))) |
| 58 | |
| 59 | // compare items for each key |
| 60 | let i = -1 |
| 61 | let equal = true |
| 62 | while (equal && ++i < keys.length) { |
| 63 | const comparingKey = keys[i] |
| 64 | equal = ArrayUtil.isEqual(a[comparingKey], b[comparingKey]) |
| 65 | } |
| 66 | return equal |
| 67 | } |
| 68 | |
| 69 | // compare dates |
| 70 | if (a instanceof Date) { |
no test coverage detected