如何使用lodash js检查字符串是否存在于数组中？

Question

My snippet looks something like this:

let go = "hello";

let col =["12","hello","14","15"];

let f = _.some(col,go);

I want to check whether the go value is present in col TRUE/FALSE. When I run this I get , f=false? How can I fix this or how to check the presence of a string in an array of strings (with lodash)?

Answer 1

Should work

let go = "hello";

let col =["12","hello","14","15"];

let f = _.includes(col,go);

https://lodash.com/docs#includes

Answer 2

With only javascript you can use indexOf . If it is present it will return the index of the element else -1

 let go = "12"; let col = ["12", "hello", "14", "15"]; var isElemPresent = (col.indexOf(go) !== -1) ? true : false console.log(isElemPresent) 

Answer 3

It seems that You misunderstood what the last arguments of _.some is. You can't use it as a value for equality test, but You need to make one yourself like this:

let f = _.some(col, function(go) {return go === "hello"});

And here is working Fiddle for You.

Or alternatively you can use es6 magic and call includes directly from your array like this

 let go = "hello"; let col =["12","hello","14","15"]; alert(col.includes(go))