_.concat lodash vs Array.prototype.concat()

Question

_.concat lodash和Array.prototype.concat()有什么不同？

Answer 1

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这些函数的工作方式相同，但语法不同：

_.concat ->

let array1 = [1, 2, 3];
let array2 = [4, 5, 6],
let array3 = [7, 8, 9];
let allArrays = _.concat(array1 , array2 , array3);
console.log(allArrays ); // [1,2,3,4,5,6,7,8,9]

array.concat ->

let array1 = [1, 2, 3];
let array2 = [4, 5, 6],
let array3 = [7, 8, 9];
let allArrays = [].concat(array1 , array2 , array3);
console.log(allArrays ); // [1,2,3,4,5,6,7,8,9]

或array.concat ->

let array1 = [1, 2, 3];
let array2 = [4, 5, 6],
let array3 = [7, 8, 9];
let allArrays = [];
allArrays.concat(array1 , array2 , array3);
console.log(allArrays ); // [1,2,3,4,5,6,7,8,9]

基本上，array.concat是从数组中调用的，_.concat不需要调用数组