Lodash - a javascript power tool

Lodash, a lightweight replacement for Underscore.js, is a popular JavaScript utility library that simplifies common programming tasks. Explore the top 20 Lodash functions below to enhance your JavaScript skills:

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1. _.get

• Safely retrieves a nested property from an object, avoiding errors if the property doesn't exist.

const obj = { a: { b: { c: 42 } } }; _.get(obj, 'a.b.c', 'default'); // 42

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2. _.set

• Sets the value of a nested property in an object, creating intermediate properties if they don’t exist.

const obj = {}; _.set(obj, 'a.b.c', 42); console.log(obj); // { a: { b: { c: 42 } } }

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3. _.cloneDeep

• Creates a deep copy of an object or array.

const arr = [{ a: 1 }]; const deepClone = _.cloneDeep(arr);

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4. _.debounce

• Delays the execution of a function until after a specified time has passed since its last call.

const log = _.debounce(() => console.log('Debounced!'), 300); window.addEventListener('resize', log);

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5. _.throttle

• Ensures a function is executed at most once in a specified time interval.

const log = _.throttle(() => console.log('Throttled!'), 1000); window.addEventListener('scroll', log);

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6. _.isEmpty

• Checks if a value is an empty object, array, or falsy value.

_.isEmpty([]); // true _.isEmpty({}); // true _.isEmpty(''); // true

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7. _.merge

• Deeply merges two or more objects, combining their properties.

const obj1 = { a: { b: 1 } }; const obj2 = { a: { c: 2 } }; _.merge(obj1, obj2); // { a: { b: 1, c: 2 } }

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8. _.pick

• Creates an object composed of the selected properties.

const obj = { a: 1, b: 2, c: 3 }; _.pick(obj, ['a', 'c']); // { a: 1, c: 3 }

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9. _.omit

• Creates an object excluding the specified properties.

const obj = { a: 1, b: 2, c: 3 }; _.omit(obj, ['b']); // { a: 1, c: 3 }

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10. _.uniq

• Removes duplicate values from an array.

_.uniq([1, 2, 2, 3]); // [1, 2, 3]

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11. _.groupBy

• Groups the elements of an array based on a provided criterion.

_.groupBy([6.1, 4.2, 6.3], Math.floor); // { '4': [4.2], '6': [6.1, 6.3] }

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12. _.sortBy

• Sorts an array of objects based on specific properties or criteria.

const users = [{ name: 'Tom', age: 30 }, { name: 'Jerry', age: 20 }]; _.sortBy(users, 'age'); // [{ name: 'Jerry', age: 20 }, { name: 'Tom', age: 30 }]

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13. _.map

• Creates a new array by transforming each element in a collection.

_.map([1, 2, 3], n => n * 2); // [2, 4, 6]

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14. _.filter

• Creates an array with elements that pass the provided condition.

_.filter([1, 2, 3, 4], n => n % 2 === 0); // [2, 4]

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15. _.find

• Finds the first element that satisfies a condition.

_.find([1, 2, 3, 4], n => n > 2); // 3

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16. _.flatten

• Flattens a nested array into a single-level array.

_.flatten([1, [2, [3, [4]]]]); // [1, 2, [3, [4]]]

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17. _.flattenDeep

• Flattens a nested array into a fully single-level array.

_.flattenDeep([1, [2, [3, [4]]]]); // [1, 2, 3, 4]

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18. _.difference

• Returns the values from the first array that are not in the second array.

const obj = { a: { b: { c: 42 } } }; _.get(obj, 'a.b.c', 'default'); // 42

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19. _.chunk

• Splits an array into groups of the specified size.

const obj = {}; _.set(obj, 'a.b.c', 42); console.log(obj); // { a: { b: { c: 42 } } }

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20. _.isEqual

• Performs a deep comparison to determine if two values are equivalent.

const arr = [{ a: 1 }]; const deepClone = _.cloneDeep(arr);

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Keep learning and having FUN !

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