findLastKey.md

objects.findLastKey

findLastKey(object, [predicate=(x)], [thisArg])

FindLastKey returns the key of the last property value for which a supplied function returns true

Arguments

1. object (object): input object
2. [predicate=(x)] (function): function to test against object values
3. [thisArg] (*): value of this in a function call

Returns

(string): string of the first object key whose value returns truthy against the function

Example

const result = Objects.findLastKey({ apple: 34, pear: 434, orange: 4, grapefruit: 212 }, x => x > 100 );
console.log(result);
> 'grapefruit'

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