how to use the concat function from lodash in javascript

index.tsx
npm install lodash
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index.tsx
const _ = require('lodash');
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index.tsx
const arr1 = [1, 2, 3];
const arr2 = [4, 5, 6];
const arr3 = [7, 8, 9];

const result = _.concat(arr1, arr2, arr3);

console.log(result); // [1, 2, 3, 4, 5, 6, 7, 8, 9]
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index.tsx
const arr1 = [1, 2, 3];
const val = 4;
const str = 'hello';

const result = _.concat(arr1, val, str);

console.log(result); // [1, 2, 3, 4, 'hello']
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