柴期望列表包含字符串类型的项目

Question

例如，这是列表：lst = ["69.78","","20.60","14.70","8.20","14.20","7.70","15.30"]

如何期望lst包含字符串类型的项目？

例如，这应该失败：[1,5,2]和['5', 2, '1']

Answer 1

您可以遍历数组并对每个项目调用isString：

const { assert } = require('chai');
lst.forEach(item => assert.isString(item));

Answer 2

或者你可以使用expect

const { expect } = require('chai');
lst.forEach(item => expect(item).to.be.a('string'))

Answer 3

检查是否有任何项目不是字符串

const notStrings = lst.filter(n => typeof n !== 'string') 
expect(notStrings.length).to.equal(0);