# san/no-dupe-s-else-if

disallow duplicate conditions in s-if / s-else-if chains

⚙️ This rule is included in all of "plugin:san/essential", "plugin:san/strongly-recommended" and "plugin:san/recommended".

# 📖 Rule Details

This rule disallows duplicate conditions in the same s-if / s-else-if chain.

<template>
  <!-- ✗ BAD -->
  <div s-if="isSomething(x)" />
  <div s-else-if="isSomething(x)" />

  <div s-if="a" />
  <div s-else-if="b" />
  <div s-else-if="c && d" />
  <div s-else-if="c && d" />

  <div s-if="n === 1" />
  <div s-else-if="n === 2" />
  <div s-else-if="n === 3" />
  <div s-else-if="n === 2" />
  <div s-else-if="n === 5" />

  <!-- ✓ GOOD -->
  <div s-if="isSomething(x)" />
  <div s-else-if="isSomethingElse(x)" />

  <div s-if="a" />
  <div s-else-if="b" />
  <div s-else-if="c && d" />
  <div s-else-if="c && e" />

  <div s-if="n === 1" />
  <div s-else-if="n === 2" />
  <div s-else-if="n === 3" />
  <div s-else-if="n === 4" />
  <div s-else-if="n === 5" />
</template>

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This rule can also detect some cases where the conditions are not identical, but the branch can never execute due to the logic of || and && operators.

<template>
  <!-- ✗ BAD -->
  <div s-if="a || b" />
  <div s-else-if="a" />

  <div s-if="a" />
  <div s-else-if="b" />
  <div s-else-if="a || b" />

  <div s-if="a" />
  <div s-else-if="a && b" />

  <div s-if="a && b" />
  <div s-else-if="a && b && c" />

  <div s-if="a || b" />
  <div s-else-if="b && c" />

  <div s-if="a" />
  <div s-else-if="b && c" />
  <div s-else-if="d && (c && e && b || a)" />
</template>

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# 🔧 Options

Nothing.

no-dupe-else-if (opens new window)

# 🔍 Implementation

← san/no-dupe-keys san/no-duplicate-attributes →

# san/no-dupe-s-else-if

# 📖 Rule Details

# 🔧 Options

# 👫 Related Rules

# 🔍 Implementation