What is === in javascript?
What is = in JavaScript?Equal to (=) is an assignment operator, which sets the variable on the left of the = to the value of the expression that is on its right. This operator assigns lvalue to rvalue. Show
For example, Writing a=10 is fine. If we write 10=10, ‘a’ = 10 or ‘a’ = ‘a’, it will result in a reference error. In this tutorial, you will learn:
What is == in JavaScript?Double equals (==) is a comparison operator, which transforms the operands having the same type before comparison. So, when you compare string with a number, JavaScript converts any string to a number. An empty string is always converts to zero. A string with no numeric value is converts to NaN (Not a Number), which returns false. What is === in JavaScript?=== (Triple equals) is a strict equality comparison operator in JavaScript, which returns false for the values which are not of a similar type. This operator performs type casting for equality. If we compare 2 with “2” using ===, then it will return a false value. Why use = in JavaScript?Here are the important uses of = in JavaScript: = JavaScript operator assigns a value to the left operand depends on the value of operand available on the right side. The first operand should be a variable. The basic assignment operator is =, that assigns the value of one operand to another. That is, a = b assigns the value of b to a. Why use == in JavaScript?Here are the important uses of == in JavaScript: The == operator is an equality operator. It checks whether its two operands are the same or not by changing expression from one data type to others. You can use == operator in order to compare the identity of two operands even though, they are not of a similar type. How === Works Exactly?
Example of =In the below program, there are two variables “a” and “b”. We are adding and printing their values using a third variable, “c”. The sum of the value of variable “a” and “b” is 7. Therefore, the output is 7.
Output: a = 2, b = 5, calculate c = a + b, and display c: 7 Example of ==In the below program, we have declared one variable “a” having value 10. Lastly, the statement a == 20 returns false as the value of a is 10. Output: false Example of ===In the below program, the value of variable x is 10. It is compared to 10 written in double-quotes, which is considered as a string, and therefore, the values are not strictly the same. The output of the program is false. Output: false = Vs == VS === in JavaScriptHere are the important differences between =, ==, and ===
KEY DIFFERENCES:
What is === and == in JavaScript?The main difference between the == and === operator in javascript is that the == operator does the type conversion of the operands before comparison, whereas the === operator compares the values as well as the data types of the operands.
What does == === mean?The === operator means "is exactly equal to," matching by both value and data type. The == operator means "is equal to," matching by value only.
What does triple equals mean in JavaScript?JavaScript === (Triple Equals)
The triple equals sign in JavaScript means “equality without type coersion”. That means, the type and values must both be equal. Take for example the scenario where 0 is false. If we compare with 2 equal signs, the following statement is true.
Should I use == or === in JavaScript?48 Answers. Show activity on this post. The strict equality operator ( === ) behaves identically to the abstract equality operator ( == ) except no type conversion is done, and the types must be the same to be considered equal. The == operator will compare for equality after doing any necessary type conversions.
|