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prefer-startswith.md

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Prefer _.startsWith

To check that a string starts with a substring or an array starts with an item, it's better to use _.startsWith than comparing the index to zero.

Rule Details

This rule takes no arguments.

The following patterns are considered warnings:

var x = a.indexOf(b) === 0;

if (str.indexOf('@@') !== 0) {}

The following patterns are not considered warnings:

var x = a.indexOf(b);

if (str.indexOf('@@') > 0) {}

When Not To Use It

If you do not want to use Lodash to check that an array or a string starts with an item, do not use this rule.