ReactJs Series for Beginners தமிழில்22 :Function-Default Parameter , Default Value-Variable using ||

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In JavaScript, a default parameter lets you set a default value for a function's parameter. If no value is provided when calling the function, this default value will be used. This feature, introduced in ES6 (ECMAScript 6), makes functions more flexible and prevents errors from missing arguments.

Similarly, you can provide a default value for a variable using the || (OR) operator. For example, if you have let a = 10; and write let b = a || "Default value";, b will be 10 because a is defined. However, if you use let c; (where c is undefined) and write let d = c || "Default value";, d will be "Default value" because c is undefined. This technique ensures that variables always have a meaningful value, even if no specific value is provided.

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🕘Timestamps:
00:11 - what is Default Parameter
00:53 - Example 1
05:12 - Default value for Variable using Logical OR


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