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For one line solution in Clear category for Conversion from CamelCase by andoreyrich
import assert from "assert";
var fromCamelCase = (name) => name.replace(/([A-Z])/g, ' $1').split(' ').filter(e=> e).map(e=> e.toLowerCase()).join('_');
console.log('Example:');
console.log(fromCamelCase('MyFunctionName'));
// These "asserts" are used for self-checking
assert.equal(fromCamelCase('MyFunctionName'), 'my_function_name');
assert.equal(fromCamelCase('IPhone'), 'i_phone');
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May 29, 2020