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deep-equals.ts
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deep-equals.ts
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// tslint:disable:triple-equals
export function deepEqual(a: any, b: any) {
if (a === b) {
return true;
}
if (a && b && typeof a == 'object' && typeof b == 'object') {
if (a.constructor !== b.constructor) {
return false;
}
let length;
let i;
let key;
let keys;
if (Array.isArray(a)) {
length = a.length;
if (length != b.length) {
return false;
}
for (i = length; i-- !== 0;) {
if (!deepEqual(a[i], b[i])) {
return false;
}
}
return true;
}
if (a instanceof Map) {
if (a.size !== b.size) {
return false;
}
keys = getKeys(a);
for (i = a.size; i-- !== 0;) {
if (!b.has(keys[i])) {
return false;
}
}
for (i = a.size; i-- !== 0;) {
key = keys[i];
if (!deepEqual(a.get(key), b.get(key))) {
return false;
}
}
return true;
}
if (a instanceof Set) {
if (a.size !== b.size) {
return false;
}
keys = getKeys(a);
for (i = a.size; i-- !== 0;) {
if (!b.has(keys[i])) {
return false;
}
}
return true;
}
if (a.constructor.BYTES_PER_ELEMENT && (
a instanceof Int8Array ||
a instanceof Uint8Array ||
a instanceof Uint8ClampedArray ||
a instanceof Int16Array ||
a instanceof Uint16Array ||
a instanceof Int32Array ||
a instanceof Uint32Array ||
a instanceof Float32Array ||
a instanceof Float64Array
)) {
length = a.length;
if (length != b.length) {
return false;
}
for (i = length; i-- !== 0;) {
if (a[i] !== b[i]) {
return false;
}
}
return true;
}
if (a.constructor === RegExp) {
return a.source === b.source && a.flags === b.flags;
}
if (a.valueOf !== Object.prototype.valueOf) {
return a.valueOf() === b.valueOf();
}
if (a.toString !== Object.prototype.toString) {
return a.toString() === b.toString();
}
keys = Object.keys(a);
length = keys.length;
if (length !== Object.keys(b).length) {
return false;
}
for (i = length; i-- !== 0;) {
if (!Object.prototype.hasOwnProperty.call(b, keys[i])) {
return false;
}
}
for (i = length; i-- !== 0;) {
key = keys[i];
if (!deepEqual(a[key], b[key])) {
return false;
}
}
return true;
}
// true if both NaN, false otherwise
return a !== a && b !== b;
}
function getKeys(a: any) {
const keys = [];
for (const [key] of a.entries()) {
keys.push(key);
}
return keys;
}
// tslint:enable:triple-equals