Lodash _.defaultTo() Method

Lodash _.defaultTo() method is used to check the given value and determine if a default value should be restored in its place. When the value is NaN, null, or undefined, the value given in the defaultValue parameter is returned.

Syntax:

_.defaultTo( value, defaultValue );

Parameters:

• value: This parameter holds the value to check.
• defaultValue: This parameter holds the default value to be restored.

Return Value:

This method returns the resolved value.

Example 1: In this example, we are getting the same value because the given value is a valid number.

// Requiring the lodash library  
const _ = require("lodash");

// Return the resolved value 
// by _.defaultTo() method
console.log(_.defaultTo(5, 15));

// Return the resolved value
// by _.defaultTo() method
console.log(_.defaultTo(82, 43));

Output:

5
82

Example 2: In this example, we are getting the default value because the given value is not a valid number.

// Requiring the lodash library  
const _ = require("lodash");

// When the value is NaN, defaultValue 
// is returned by _.defaultTo() method
console.log(_.defaultTo(null, 15));

// When the value is undefined, defaultValue 
// is returned by _.defaultTo() method
console.log(_.defaultTo(undefined, 43));

Output:

15
43