yoda

要求或禁止 "Yoda" 条件

一些该规则报告的问题可以通过 --fix 命令行选项 自动修复

尤达条件之所以如此命名，是因为条件的字面值排在第一位，而变量排在第二位。例如，以下是 Yoda 条件：

if ("red" === color) {
    // ...
}

这被称为尤达条件，因为它读作 "if red equals the color"，类似于星球大战角色尤达说话的方式。与排列操作数的其他方式比较：

if (color === "red") {
    // ...
}

这通常读作 "if the color equals red"，这可以说是描述比较的更自然的方式。

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规则详情

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选项

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never

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/*eslint yoda: "error"*/

if ("red" === color) {
    // ...
}

if (`red` === color) {
    // ...
}

if (`red` === `${color}`) {
    // ...
}

if (true == flag) {
    // ...
}

if (5 > count) {
    // ...
}

if (-1 < str.indexOf(substr)) {
    // ...
}

if (0 <= x && x < 1) {
    // ...
}

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/*eslint yoda: "error"*/

if (5 & value) {
    // ...
}

if (value === "red") {
    // ...
}

if (value === `red`) {
    // ...
}

if (`${value}` === `red`) {

}

exceptRange

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/*eslint yoda: ["error", "never", { "exceptRange": true }]*/

function isReddish(color) {
    return (color.hue < 60 || 300 < color.hue);
}

if (x < -1 || 1 < x) {
    // ...
}

if (count < 10 && (0 <= rand && rand < 1)) {
    // ...
}

if (`blue` < x && x < `green`) {
    // ...
}

function howLong(arr) {
    return (0 <= arr.length && arr.length < 10) ? "short" : "long";
}

onlyEquality

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/*eslint yoda: ["error", "never", { "onlyEquality": true }]*/

if (x < -1 || 9 < x) {
}

if (x !== 'foo' && 'bar' != x) {
}

if (x !== `foo` && `bar` != x) {
}

always

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/*eslint yoda: ["error", "always"]*/

if (color == "blue") {
    // ...
}

if (color == `blue`) {
    // ...
}

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/*eslint yoda: ["error", "always"]*/

if ("blue" == value) {
    // ...
}

if (`blue` == value) {
    // ...
}

if (`blue` == `${value}`) {
    // ...
}

if (-1 < str.indexOf(substr)) {
    // ...
}