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@alguerocode
Last active June 22, 2022 07:23
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deep equal operation in javascript
function deepEquals(value1, value2) {
if(typeof value1 !== typeof value2) return false;
if(value1 === value2) return true;
if (typeof value1 !== "object" && typeof value2 !== "object") {
// NaN type validation;
const [isValue1NaN, isValue2NaN] = [...arguments].map((value) => Number.isNaN(value) && typeof value === "number");
if (isValue1NaN && isValue2NaN) return true;
return value1 === value2;
}
if (Array.isArray(value1) && Array.isArray(value2)) {
if (value1.length !== value2.length) return false;
// check the element all are same
for(let i = 0; i < value1.length; i++) {
if(!deepEquals(value1[i], value2[i])) return false;
}
return true;
}
if(Array.isArray(value1) || Array.isArray(value2)) return false;
// check the two values not null and not the same reference
if(value1 !== value2) {
const value1Keys = Object.keys(value1);
const value2Keys = Object.keys(value2);
if (value1Keys.length != value2Keys.length) return false;
const isEqual = value1Keys.every((key) => {
return value2Keys.includes(key) && deepEquals(value1[key], value2[key]);
});
return isEqual;
}
return true;
}
console.log(deepEquals([{ b: 3, a: "3"}], [{ a: "3", b: 13}])); // true
console.log(deepEquals([{ d: { welcome: [1, 1] } }], [{ d: { d: [1, 1] } }])); // false
console.log(deepEquals([{ d: { welcome: [1, 1] } }], [{ d: { welcome: [1, 2] } }])); // false
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