Declaration of iterator variable in JSLint is flagged as warning

Question

How to declare an iterator for loop variable that passes JSLint.com validation.

I have tried var, let, and neither work. I simplified my script down to this line. JSlint.com will not progress past this warning. Have googled it and tried every combination of for loops I can thing of. I have enabled allowing for loops, and read the JSlint nazi help guide.

/*jslint
 for
*/
function test() {
    "use strict";
    for (let i = 0; i < 5; i += 1) {
        console.log(i);
    }
}

JSLint.com flags:

Unexpected 'let'.
    for (let i = 0; i < 5; i += 1) {

This is not an unused variable problem. To prove it, I changed it to console log i, the only variable, it gives the same error, whether in strict mode or not.JSLint does support ES6

Possible duplicate of [JSLint unused variable error](https://stackoverflow.com/questions/8031510/jslint-unused-variable-error) — zero298, Jan 30 '19 at 15:20
Does jslint support the ES6 `let` keyword? Try using eslint instead. — Bergi, Jan 30 '19 at 16:27
JSlint support let keyword, but must either use all let, or all var, can't mix them. — run_the_race, Jan 30 '19 at 17:16
@zero298 This is not an unused variable problem. To prove it, I changed it to console log i, the only variable, it gives the same error, whether in strict mode or not. — run_the_race, Feb 01 '19 at 13:31

Lloyd Smith · Accepted Answer · 2019-01-30T16:13:56.687

1

accordingto JSlint http://www.jslint.com/help.html#for JSLint does not recommend use of the for statement. Use array methods like forEach instead. The for option will suppress some warnings. The forms of for that JSLint accepts are restricted, excluding the new ES6 forms. edit : this works if you enable for

function test(){
let i = 0;
for (i = 0; i < 5; i += 1) {
       console.log(i);
    }
}

edited Jan 30 '19 at 16:13

answered Jan 30 '19 at 16:07

Lloyd Smith

71
4

Thank you, that was the root cause! Took a little more tweaking to completely. function test() { "use strict"; let i; for (i = 0; i < 5; i += 1) { window.console.log(i); } } – run_the_race Jan 30 '19 at 17:17

Declaration of iterator variable in JSLint is flagged as warning

1 Answers1