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tessl/npm-lodash-isinteger

The lodash method isInteger exported as a module for checking if a value is an integer

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lodash.isinteger

lodash.isinteger is a modularized version of lodash's isInteger utility function that checks if a given value is an integer. It performs type checking to ensure the input is a number and validates that it equals its integer conversion, effectively filtering out decimals, strings, and other non-integer data types.

Package Information

  • Package Name: lodash.isinteger
  • Package Type: npm
  • Language: JavaScript
  • Installation: npm install lodash.isinteger

Core Imports

var isInteger = require('lodash.isinteger');

For ES6 modules (with transpiler):

import isInteger from 'lodash.isinteger';

Basic Usage

var isInteger = require('lodash.isinteger');

// Check various values
console.log(isInteger(3));           // => true
console.log(isInteger(3.0));         // => true  
console.log(isInteger(3.2));         // => false
console.log(isInteger(Number.MIN_VALUE)); // => false
console.log(isInteger(Infinity));    // => false
console.log(isInteger('3'));         // => false
console.log(isInteger(null));        // => false
console.log(isInteger(undefined));   // => false

Capabilities

Integer Validation

Checks if a value is an integer by validating it's a number type and equals its integer conversion.

/**
 * Checks if `value` is an integer.
 * 
 * Note: This method is based on Number.isInteger.
 * 
 * @param {any} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
 */
function isInteger(value);

Parameter Details:

  • value (any): The value to check - can be any type

Return Value:

  • boolean: Returns true if value is an integer, false otherwise

Behavior:

  • Returns true for whole numbers (positive, negative, or zero)
  • Returns false for decimal numbers, strings, objects, null, undefined
  • Returns false for special number values like Infinity, -Infinity, and NaN
  • Handles edge cases like Number.MIN_VALUE correctly (returns false)

Examples:

// Integer values
isInteger(0);        // => true
isInteger(-1);       // => true  
isInteger(42);       // => true
isInteger(3.0);      // => true (mathematically an integer)

// Non-integer values
isInteger(3.14);     // => false (decimal)
isInteger('3');      // => false (string)
isInteger([]);       // => false (array)
isInteger({});       // => false (object)
isInteger(null);     // => false
isInteger(undefined); // => false

// Special number values
isInteger(Infinity);     // => false
isInteger(-Infinity);    // => false
isInteger(NaN);          // => false
isInteger(Number.MIN_VALUE); // => false (very small decimal)

docs

index.md

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